UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-5531 --------------------------------------------- MassMutual Participation Investors -------------------------------------------------------------------------------- (Exact name of registrant as specified in charter) 1500 Main Street, Suite 600, Springfield, MA 01115 -------------------------------------------------------------------------------- (Address of principal executive offices) (Zip code) Rodney J. Dillman, Vice President and Secretary 1500 Main Street, Suite 2800, Springfield, MA 01115 -------------------------------------------------------------------------------- (Name and address of agent for service) Registrant's telephone number, including area code: 413-226-1000 ---------------------------- Date of fiscal year end: 12/31 ------------------ Date of reporting period: 6/30/06 ------------------ Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection and policymaking roles. A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. ss. 3507. ITEM 1. REPORT TO STOCKHOLDERS. Attached hereto is the semi-annual shareholder report transmitted to shareholders pursuant to Rule 30e-1 of the Investment Company Act of 1940, as amended. MASSMUTUAL PARTICIPATION INVESTORS REPORT FOR THE SIX MONTHS ENDED JUNE 30, 2006 [LOGO] ADVISER Babson Capital Management LLC 1500 Main Street Springfield, Massachusetts 01115 INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM KPMG LLP Boston, Massachusetts 02110 COUNSEL TO THE TRUST Ropes & Gray LLP Boston, Massachusetts 02110 CUSTODIAN Citibank, N.A. New York, New York 10043 TRANSFER AGENT & REGISTRAR Shareholder Financial Services, Inc. P.O. Box 173673 Denver, Colorado 80217-3673 1-800-647-7374 INTERNET WEBSITE: WWW.BABSONCAPITAL.COM/MPV MassMutual Participation Investors c/o Babson Capital Management LLC [LOGO] 1500 Main Street, Suite 600 Springfield, Massachusetts 01115 (413) 226-1516 -------------------------------------------------------------------------------- INVESTMENT OBJECTIVE AND POLICY MassMutual Participation Investors (the "Trust") is a closed-end management investment company, first offered to the public in 1988, whose shares are traded on the New York Stock Exchange under the trading symbol "MPV". The Trust's share price can be found in the financial section of most newspapers as "MassPrt" or "MassMuPrt" under the New York Stock Exchange listings. The Trust's investment objective is to maximize total return by providing a high level of current income, the potential for growth of income, and capital appreciation. The Trust's principal investments are privately placed, below-investment grade, long-term corporate debt obligations purchased directly from their issuers, which tend to be smaller companies. At least half of these investments normally include equity features such as warrants, conversion rights, or other equity features that provide the Trust with the opportunity to realize capital gains. The Trust will also invest in publicly traded debt securities (including high yield securities), again with an emphasis on those with equity features, and in convertible preferred stocks and, subject to certain limitations, readily marketable equity securities. In addition, the Trust may temporarily invest in high quality, readily marketable securities. Babson Capital Management LLC ("Babson Capital") manages the Trust on a total return basis. The Trust distributes substantially all of its net income to shareholders each year. Accordingly, the Trust pays dividends to shareholders quarterly in January, May, August, and November. All registered shareholders are automatically enrolled in the Dividend Reinvestment and Cash Purchase Plan unless cash distributions are requested. FORM N-Q The Trust files its complete schedule of portfolio holdings with the U.S. Securities and Exchange Commission ("SEC") for the first and third quarters of each fiscal year on Form N-Q. This information is available (i) on the SEC's website at http://www.sec.gov; and (ii) at the SEC's Public Reference Room in Washington, DC (which information on their operation may be obtained by calling 1-800-SEC-0330). A complete schedule of portfolio holdings as of each quarter-end is available upon request by calling, toll-free, 866-399-1516. PROXY VOTING POLICIES & PROCEDURES; PROXY VOTING RECORD The Trustees of the Trust have delegated proxy voting responsibilities relating to the voting of securities held by the Trust to Babson Capital. A description of Babson Capital's proxy voting policies and procedures is available (1) without charge, upon request, by calling, toll-free 866-399-1516; (2) on the Trust's website: http:// www.babsoncapital.com/mpv; and (3) on the SEC's website at http://www.sec.gov. Information regarding how the Trust voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is available (1) on the Trust's website: http:// www.babsoncapital.com/mpv; and (2) on the SEC's website at http://www.sec.gov. MPV Listed NYSE TO OUR SHAREHOLDERS August 9, 2006 We are pleased to present the June 30, 2006 Semi-Annual Report of MassMutual Participation Investors (the "Trust"). At the Trust's Quarterly Board of Trustees Meeting, which was held on July 18, 2006, the Trustees appointed William J. Barrett as a Trustee, thereby increasing the size of the Board from eight to nine. Mr. Barrett is currently President of Barrett-Gardner Associates, Inc., an investment banking firm. The Trust's Board of Trustees declared a quarterly dividend of 24 cents per share, payable on August 14, 2006 to shareholders of record on July 28, 2006. A dividend of 24 cents per share was paid in the previous quarter. U.S. equity markets, as measured by several broad market indices, posted mixed returns. During the quarter ended June 30, 2006, large company stocks, as approximated by the Dow Jones Industrial Average, increased 0.94%, while smaller company stocks, as approximated by the Russell 2000 Index, decreased 5.02%. For the six months ended June 30, 2006, returns were 5.22% and 8.21%, respectively. U.S. fixed income markets, as measured by selected indices, were also mixed during the quarter. The Lehman Brothers Government/Credit Index and the Lehman Brothers U.S. Corporate High Yield Index decreased 0.14% and increased 0.25%, respectively, for the quarter. For the six months ended June 30, 2005, returns were -1.15% and 3.14%, respectively. For the quarter ended June 30, 2006, the Trust earned 26 cents per share, of which 2 cents per share was from nonrecurring items. The Trust earned 27 cents per share in the previous quarter, of which 3 cents per share was from nonrecurring items. The Trust's net assets as of June 30, 2006 totaled $129,932,933 or $13.29 per share compared to $125,929,579 or $12.90 per share on March 31, 2006. This translated into a net portfolio return of 4.97% for the quarter, and 10.90% for the six months ended June 30, 2006, based on the change in the Trust's net assets assuming the reinvestment of all dividends. Long term, the Trust's portfolio had average annualized returns of 24.11%, 17.37%, 14.52%, and 13.94% for the 1-, 5-, 10- and 15- year time periods ended June 30, 2006, respectively, based on change in net assets with the reinvestment of all dividends. During the quarter, the Trust made private placement investments in six new issuers and closed two "follow-on" investments, totaling approximately $6.9 million. The follow-on investments purchased by the Trust were in Eagle Pack Pet Foods, Inc. and Terra Renewal Services, Inc. The six new issuers the Trust invested in were Bravo Sports Holding Corporation, F H S Holdings LLC, Flutes, Inc., K N B Holdings Corporation, Magnatech International, Inc. and Overton's Holding Company. The weighted average coupon of the bond portion of these investments was 11.91%. (A brief description of these investments can be found in the consolidated schedule of investments.) Thank you for your continued interest in and support of MassMutual Participation Investors. Sincerely, PORTFOLIO COMPOSITION AS OF 06/30/06* /s/ Clifford M. Noreen [PIE CHART APPEARS HERE] -------------------------- Clifford M. Noreen Public Equity 0.4% President Private High Yield Debt 46.2% Private Investment Grade Debt 6.3% Private/Restricted Equity 16.9% Cash & Short Term Investments 9.3% Public High Yield Debt 20.9% *Based on market value of total investments -------------------------------------------------------------------------------- 1 CONSOLIDATED STATEMENT OF MASSMUTUAL PARTICIPATION INVESTORS ASSETS AND LIABILITIES June 30, 2006 (Unaudited) ASSETS: Investments (See Consolidated Schedule of Investments) Corporate restricted securities at fair value (Cost - $96,023,050) $ 97,532,125 Corporate public securities at market value (Cost - $30,589,499) 29,834,071 Short-term securities at amortized cost 9,198,378 ------------ 136,564,574 Cash 3,826,997 Interest receivable 1,874,094 Receivable for investments sold 867,920 Other assets 12,635 ------------ TOTAL ASSETS 143,146,220 ------------ LIABILITIES: Payable for investments purchased $ 425,171 Investment advisory fee payable 292,349 Note payable 12,000,000 Interest payable 88,933 Accrued expenses 173,164 Accrued taxes payable 233,670 ------------ TOTAL LIABILITIES 13,213,287 ------------ TOTAL NET ASSETS $129,932,933 ============ NET ASSETS: Common shares, par value $.01 per share; an unlimited number authorized $ 97,780 Additional paid-in capital 90,566,298 Retained net realized gain on investments, prior years 25,860,274 Undistributed net investment income 3,601,979 Accumulated net realized gain on investments 9,169,288 Net unrealized appreciation of investments 637,314 ------------ TOTAL NET ASSETS $129,932,933 ============ COMMON SHARES ISSUED AND OUTSTANDING 9,777,975 ============ NET ASSET VALUE PER SHARE $ 13.29 ============ SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. -------------------------------------------------------------------------------------------- 2 CONSOLIDATED STATEMENT OF OPERATIONS MASSMUTUAL PARTICIPATION INVESTORS For the six months ended June 30, 2006 (Unaudited) INVESTMENT INCOME: Interest $ 5,833,544 Dividends 490,238 ------------ TOTAL INVESTMENT INCOME 6,323,782 ------------ EXPENSES: Investment advisory fees 575,691 Interest 366,596 Trustees' fees and expenses 61,200 Reports to shareholders 51,000 Professional fees 48,000 Transfer agent/registrar's expenses 8,400 Other 13,666 ------------ TOTAL EXPENSES 1,124,553 ------------ INVESTMENT INCOME - NET 5,199,229 ------------ NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized gain on investments before taxes 8,470,874 Income tax expense (177,888) ------------ Net realized gain on investments 8,292,986 Net change in unrealized appreciation of investments before taxes (753,264) Net change in deferred income tax expense 59,081 ------------ Net change in unrealized appreciation of investments (694,183) NET GAIN ON INVESTMENTS 7,598,803 ------------ NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS $ 12,798,032 ============ SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. -------------------------------------------------------------------------------------------- 3 CONSOLIDATED STATEMENT OF CASH FLOWS MASSMUTUAL PARTICIPATION INVESTORS For the six months ended June 30, 2006 (Unaudited) NET INCREASE IN CASH: Cash flows from operating activities: Interest and dividends received $ 6,482,631 Interest expense paid (366,596) Operating expenses paid (760,479) Income taxes paid (3,599,079) ------------ NET CASH PROVIDED BY OPERATING ACTIVITIES 1,756,477 ------------ Cash flows from investing activities: Purchases/Proceeds/Maturities from short-term portfolio securities, net 5,439,584 Purchases of portfolio securities (22,426,509) Proceeds from disposition of portfolio securities 21,001,461 ------------ NET CASH PROVIDED BY INVESTING ACTIVITIES 4,014,536 ------------ NET CASH PROVIDED BY OPERATING AND INVESTING ACTIVITIES 5,771,013 ------------ Cash flows from financing activities: Cash dividends paid from net investment income (5,169,026) Receipts for shares issued on reinvestment of dividends 459,134 ------------ NET CASH USED FOR FINANCING ACTIVITIES (4,709,892) ------------ NET INCREASE IN CASH 1,061,121 Cash - beginning of year 2,765,876 ------------ CASH - END OF PERIOD $ 3,826,997 ============ RECONCILIATION OF NET INCREASE IN NET ASSETS TO NET CASH PROVIDED BY OPERATING AND INVESTING ACTIVITIES: NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS $ 12,798,032 ------------ Increase in investments (4,144,678) Decrease in interest and dividends receivable 570,425 Increase in receivable for investments sold (382,653) Decrease in other assets 145 Increase in payable for investments purchased 425,171 Increase in investment advisory fee payable 24,556 Decrease in accrued expenses (39,713) Decrease in accrued taxes payable (3,480,272) ------------ TOTAL ADJUSTMENTS TO NET ASSETS FROM OPERATIONS (7,027,019) ------------ NET CASH PROVIDED BY OPERATING AND INVESTING ACTIVITIES $ 5,771,013 ============ SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. -------------------------------------------------------------------------------------------- 4 CONSOLIDATED STATEMENTS OF MASSMUTUAL PARTICIPATION INVESTORS CHANGES IN NET ASSETS For the six months ended For the 06/30/2006 year ended (Unaudited) 12/31/2005 ------------ ------------ INCREASE IN NET ASSETS: OPERATIONS: Investment income - net $ 5,199,229 $ 9,643,282 Net realized gain on investments 8,292,986 8,306,079 Net change in unrealized appreciation (depreciation) of investments (694,183) 2,350,516 ------------ ------------ Net increase in net assets resulting from operations 12,798,032 20,299,877 Increase from common shares issued on reinvestment of dividends Common shares issued (2006 - 33,745; 2005 - 71,671) 459,134 927,722 Dividends to shareholders from: Net investment income (2006 - $0.24 per share; 2005 - $1.01 per share) (2,343,199) (9,818,640) ------------ ------------ TOTAL INCREASE IN NET ASSETS 10,913,967 11,408,959 NET ASSETS, BEGINNING OF YEAR 119,018,966 107,610,007 ------------ ------------ NET ASSETS, END OF PERIOD/YEAR (including undistributed net investment income of $3,601,979 and $923,836, respectively) $129,932,933 $119,018,966 ============ ============ SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. ------------------------------------------------------------------------------------------------------------- 5 CONSOLIDATED SELECTED FINANCIAL HIGHLIGHTS MASSMUTUAL PARTICIPATION INVESTORS Selected data for each share of beneficial interest outstanding: For the six months ended For the years ended December 31, 06/30/2006 ---------------------------------------------------------------------- (Unaudited) 2005 2004 2003 2002 2001 ---------- ---------- ---------- ---------- ---------- ---------- Net asset value: Beginning of year $ 12.21 $ 11.13 $ 9.84 $ 8.78 $ 9.12 $ 9.75 ---------- ---------- ---------- ---------- ---------- ---------- Net investment income (a) 0.53 0.99 1.00 0.80 0.87 0.93 Net realized and unrealized gain (loss) on investments 0.78 1.09 (b) 1.36 1.21 (0.35) (0.61) ---------- ---------- ---------- ---------- ---------- ---------- Total from investment operations 1.31 2.08 2.36 2.01 0.52 0.32 ---------- ---------- ---------- ---------- ---------- ---------- Dividends from net investment income to common shareholders (0.24) (1.01) (1.10) (0.96) (0.86) (0.96) Change from issuance of shares 0.01 0.01 0.03 0.01 -- 0.01 ---------- ---------- ---------- ---------- ---------- ---------- Total distributions (0.23) (1.00) (1.07) (0.95) (0.86) (0.95) ---------- ---------- ---------- ---------- ---------- ---------- Net asset value: End of period/year $ 13.29 $ 12.21 $ 11.13 $ 9.84 $ 8.78 $ 9.12 ---------- ---------- ---------- ---------- ---------- ---------- Per share market value: End of period/year $ 14.85 $ 14.05 $ 13.31 $ 11.65 $ 9.40 $ 9.10 ========== ========== ========== ========== ========== ========== Total investment return Market value 7.50% 17.25% 25.77% 35.50% 12.58% (8.02)% Net asset value (c) 10.90% 22.51% 25.14% 23.72% 5.70% 3.41% Net assets (in millions): End of period/year $ 129.93 $ 119.02 $ 107.61 $ 94.40 $ 83.59 $ 86.09 Ratio of operating expenses to average net assets 1.23%(d) 1.45% 1.63% 1.65% 1.27% 1.22% Ratio of interest expense to average net assets 0.60%(d) 0.80% 0.89% 0.97% 1.08% 1.47% Ratio of total expenses to average net assets 1.83%(d) 2.25% 2.52% 2.62% 2.35% 2.69% Ratio of net investment income to average net assets 8.44%(d) 8.45% 9.60% 8.55% 9.42% 9.70% Portfolio turnover 17.39% 31.50% 51.25% 55.08% 35.32% 21.58% (a) Calculated using average shares. (b) Amount includes $0.10 per share in litigation proceeds. (c) Net asset value return represents portfolio returns based on change in the Trust's net asset value assuming the reinvestment of all dividends and distributions which differs from the total investment return based on the Trust's market value due to the difference between the Trust's net asset value and the market value of its shares outstanding; past performance is no guarantee of future results. (d) Annualized. Senior securities: Total principal amount (in millions) $ 12 $ 12 $ 22.5 $ 22.5 $ 22.5 $ 22.5 Asset coverage per $1,000 of indebtedness $ 11,828 $ 10,918 $ 5,783 $ 5,195 $ 4,715 $ 4,826 SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. ------------------------------------------------------------------------------------------------------------------------------- 6 CONSOLIDATED SCHEDULE OF INVESTMENTS MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES - 75.06%: (A) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- PRIVATE PLACEMENT INVESTMENTS - 70.46% A T I ACQUISITION COMPANY A for-profit post-secondary school serving students in Texas, Florida and Arizona. 12% Senior Subordinated Note due 2012 $ 1,125,000 04/08/04 $ 1,125,000 $ 995,602 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 1,230 shs. 04/08/04 -- 12 Warrant, exercisable until 2012, to purchase preferred stock at $.01 per share (B) 33,505 shs. 03/23/06 33,860 335 ------------- ------------- 1,158,860 995,949 ------------- ------------- ADORN, INC. A manufacturer of wall panels, cabinets, moldings and countertops for houses and recreational vehicles. 12.5% Subordinated Note due 2010 $ 1,125,000 02/29/00 1,052,875 1,125,000 Warrant, exercisable until 2010, to purchase common stock at $.02 per share (B) 192 shs. 02/29/00 162,931 277,171 ------------- ------------- 1,215,806 1,402,171 ------------- ------------- AMERCABLE, INC. A manufacturer of electric power, instrumentation and control cables, primarily for the mining and oil and gas industries. 12% Senior Subordinated Note due 2013 $ 583,333 04/08/05 551,685 585,194 Limited Partnership Interest (B) 0.19% int. 04/07/05 41,667 64,093 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 66 shs. 04/08/05 64,833 101,668 ------------- ------------- 658,185 750,955 ------------- ------------- AMERICAN HOSPICE MANAGEMENT HOLDING LLC A for-profit hospice care provider in the United States. 12% Senior Subordinated Note due 2010 $ 1,125,000 01/22/04 1,021,859 1,129,219 Preferred Class A Unit (B) 1,337 uts. 01/22/04 133,700 120,330 Common Class B Unit 1,610 uts. 01/22/04 1 154,458 ------------- ------------- 1,155,560 1,404,007 ------------- ------------- ARROW TRU-LINE HOLDINGS, INC. A manufacturer of hardware for residential and commercial overhead garage doors in North America. 12% Senior Subordinated Note due 2012 $ 861,702 05/18/05 808,524 865,633 Common Stock (B) 263 shs. 05/18/05 263,298 345,976 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 69 shs. 05/18/05 59,362 90,705 ------------- ------------- 1,131,184 1,302,314 ------------- ------------- AUGUSTA SPORTSWEAR HOLDING CO. A manufacturer and distributor of athletic apparel, activewear and team uniforms. 12% Senior Subordinated Note due 2012 $ 893,000 12/31/04 837,112 895,614 Common Stock (B) 275 shs. * 275,108 494,950 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 73 shs. 12/31/04 63,254 130,956 ------------- ------------- 1,175,474 1,521,520 ------------- ------------- *12/31/04, 03/31/05 and 05/02/06. --------------------------------------------------------------------------------------------------------------------------------- 7 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- BEACON MEDICAL PRODUCTS, INC. A designer, manufacturer and marketer of medical air and gas distribution systems. 9% Senior Secured Revolving Credit Facility due 2007 (C) $ 131,792 04/09/02 $ 131,792 $ 131,792 9% Senior Secured Tranche A Note due 2008 (C) $ 309,746 04/09/02 309,746 309,746 12% Senior Secured Note due 2010 $ 412,112 04/09/02 366,744 412,112 Limited Partnership Interest of Riverside Capital Appreciation Fund IV, L.P. (B) 5.09% int. 04/09/02 87,045 342,609 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 794 shs. 04/09/02 72,856 312,550 ------------- ------------- 968,183 1,508,809 ------------- ------------- BETA BRANDS LTD. A manufacturer of hard candy and chocolate-coated products sold primarily to the Canadian market. 5% Promissory Note due 2009 (B) $ 96,698 03/31/04 96,698 -- Warrant, exercisable until 2009, to purchase common stock at $.01 per share (B) 2,421 shs. 03/31/04 1 -- ------------- ------------- 96,699 -- ------------- ------------- BRAVO SPORTS HOLDING CORPORATION A designer and marketer of niche branded consumer products including canopies, trampolines, in-line skates, skateboards, and urethane wheels. 12.5% Senior Subordinated Note due 2014 $ 1,207,902 06/30/06 1,134,984 1,177,825 Preferred Stock Class A (B) 465 shs. 06/30/06 141,946 134,850 Common Stock (B) 1 shs. 06/30/06 152 145 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 164 shs. 06/30/06 48,760 2 ------------- ------------- 1,325,842 1,312,822 ------------- ------------- C & J SPEC-RENT SERVICES, INC. A provider of coiled tubing and pressure pumping services to the oil and gas industry in Texas and Louisiana. 10% Senior Secured Term Note due 2012 $ 886,597 08/12/05 886,567 905,121 14% Senior Subordinated Note due 2013 $ 653,153 08/12/05 596,138 661,274 Common Stock (B) 268,657 shs. 08/12/05 268,657 515,015 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 49,552 shs. 08/12/05 60,910 94,992 ------------- ------------- 1,812,272 2,176,402 ------------- ------------- C & M CONVEYOR, INC. A manufacturer and supplier of material handling systems to the corrugated sheet and container industry. 9.5% Senior Secured Term Note due 2007 $ 433,735 09/13/02 433,735 434,226 11% Senior Subordinated Note due 2010 $ 478,916 09/13/02 463,374 480,972 Common Stock (B) 180,723 shs. 09/13/02 180,723 406,627 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 78,386 shs. 09/13/02 34,428 176,369 ------------- ------------- 1,112,260 1,498,194 ------------- ------------- --------------------------------------------------------------------------------------------------------------------------------- 8 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- CAINS FOODS, L.P. A producer of mayonnaise and sauce products for both the retail and food service markets. Limited Partnership Interest 1.81% int. 09/29/95 $ 22,519 $ 161,905 ------------- ------------- CAPESUCCESS LLC A provider of diversified staffing services. Preferred Membership Interests (B) 806 uts. 04/29/00 3,598 180 Common Membership Interests (B) 10,421 uts. 04/29/00 46,706 2,332 ------------- ------------- 50,304 2,512 ------------- ------------- CAPITAL SPECIALTY PLASTICS, INC. A producer of desiccant strips used for packaging pharmaceutical products. Common Stock (B) 55 shs. * 252 27,704 ------------- ------------- COEUR, INC. A producer of proprietary, disposable power injection syringes. 8.75% Senior Secured Term Note due 2010 $ 264,493 04/30/03 264,493 264,436 11.5% Senior Subordinated Note due 2011 $ 242,754 04/30/03 225,870 242,842 Common Stock (B) 72,463 shs. 04/30/03 72,463 127,825 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 50,099 shs. 04/30/03 23,317 88,375 ------------- ------------- 586,143 723,478 ------------- ------------- COINING CORPORATION OF AMERICA LLC A manufacturer of close tolerance parts and metal stampings. 10.74% Senior Secured Revolving Credit Facility due 2007 (C) $ 61,728 01/07/02 61,728 61,728 10.21% Senior Secured Tranche A Note due 2007 (C) $ 434,222 06/26/01 434,222 424,678 13% Senior Secured Tranche B Note due 2008 $ 370,370 06/26/01 370,370 365,154 Limited Partnership Interest (B) 3.65% int. 06/26/01 185,185 166,667 Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 61,163 shs. 06/26/01 45,370 86,974 ------------- ------------- 1,096,875 1,105,201 ------------- ------------- CONNOR SPORT COURT INTERNATIONAL, INC. A designer and manufacturer of outdoor and indoor synthetic sports flooring and other temporary flooring products. 12% Senior Subordinated Note due 2012 (D) $ 1,059,417 ** 974,588 953,475 Limited Partnership Interest (B) 4.43% int. *** 103,135 1,031 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 92 shs. ** 84,829 1 ------------- ------------- 1,162,552 954,507 ------------- ------------- *12/30/97 and 05/29/99. **08/12/04 and 01/18/05. ***08/12/04 and 01/14/05. --------------------------------------------------------------------------------------------------------------------------------- 9 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- CONSOLIDATED FOUNDRIES HOLDINGS A manufacturer of engineered cast metal components for the global aerospace and defense industries. 12% Senior Subordinated Note due 2013 $ 1,157,143 06/15/05 $ 1,108,178 $ 1,129,727 Common Stock (B) 269 shs. * 278,521 242,388 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 54 shs. 06/15/05 53,295 1 ------------- ------------- 1,439,994 1,372,116 ------------- ------------- COREPHARMA LLC A manufacturer of oral dose generic pharmaceuticals targeted at niche applications. 12% Senior Subordinated Note due 2013 $ 1,350,000 08/04/05 1,281,897 1,313,435 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 10 shs. 08/04/05 72,617 -- ------------- ------------- 1,354,514 1,313,435 ------------- ------------- CORVEST GROUP, INC. A manufacturer and distributor of promotional products. 12% Senior Subordinated Note due 2009 (D) $ 2,045,455 ** 1,982,045 511,359 Common Stock (B) 30 shs. ** 51,136 -- Limited Partnership Interest (B) 10.23% int. ** 150,377 -- Warrant, exercisable until 2007, to purchase common stock at $.01 per share (B) 171 shs. ** 157,343 -- ------------- ------------- 2,340,901 511,359 ------------- ------------- DEXTER MAGNETICS TECHNOLOGIES, INC. A designer, fabricator, assembler and distributor of industrial magnets and subassemblies in North America and Europe. Common Stock 310 shs. 07/19/01 309,783 426,449 Warrant, exercisable until 2006, to purchase common stock at $.01 per share 157 shs. 07/19/01 132,677 216,143 ------------- ------------- 442,460 642,592 ------------- ------------- DIRECTED ELECTRONICS, INC. A designer and distributor of brand name automotive security systems, audio products and installation accessories. Common Stock (B) 126,817 shs. 12/19/05 40,518 1,497,453 Limited Partnership Interest (B) 4.61% int. *** 26,223 300,428 ------------- ------------- 66,741 1,797,881 ------------- ------------- *06/15/05 and 05/22/06. **03/05/99 and 03/24/99. ***12/22/99 and 09/14/05. --------------------------------------------------------------------------------------------------------------------------------- 10 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- DIVERSCO, INC./DHI HOLDINGS, INC. A contract provider of janitorial and equipment maintenance services and temporary production labor to industrial customers. Membership Interests of MM/Lincap Diversco Investments Ltd. LLC (B) 13.57% int. 08/27/98 $ 366,495 $ -- Preferred Stock (B) 1,639 shs. 12/14/01 1,392,067 1,252,858 Warrants, exercisable until 2011, to purchase common stock of DHI Holdings, Inc. at $.01 per share (B) 6,676 shs. * 201,655 -- ------------- ------------- 1,960,217 1,252,858 ------------- ------------- DWYER GROUP, INC. A franchiser of a variety of home repair services. 14% Senior Subordinated Note due 2011 $ 984,375 10/30/03 905,756 995,665 Common Stock (B) 3,656 shs. ** 365,600 380,224 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 1,077 shs. 10/30/03 98,719 111,967 ------------- ------------- 1,370,075 1,487,856 ------------- ------------- E X C ACQUISITION CORPORATION A manufacturer of pre-filled syringes and pump systems used for intravenous drug delivery. Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 11 shs. 06/28/04 40,875 78,808 ------------- ------------- EAGLE PACK PET FOODS, INC. A manufacturer of premium pet food sold through independent pet stores. 12% Senior Subordinated Note due 2011 $ 803,572 *** 781,636 802,959 Warrant, exercisable until 2011, to purchase common stock at $.02 per share (B) 2,163 shs. 09/24/04 20,893 44,465 ------------- ------------- 802,529 847,424 ------------- ------------- EAST RIVER VENTURES I, L.P. An acquirer of controlling or substantial interests in other entities. Limited Partnership Interest (B) 0.03% int. 01/01/01 6,609 2,027 ------------- ------------- ENZYMATIC THERAPY, INC. A manufacturer and distributor of branded natural medicines and nutritional supplements. Limited Partnership Interest (B) 0.70% int. 03/30/00 281,250 33,750 Warrant, exercisable until 2009, to purchase common stock at $.01 per share (B) 15,415 shs. 03/30/00 135,000 22,500 ------------- ------------- 416,250 56,250 ------------- ------------- *10/24/96 and 08/28/98. **10/30/03 and 01/02/04. ***09/24/04 and 4/20/06. --------------------------------------------------------------------------------------------------------------------------------- 11 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- EURO-PRO CORPORATION A designer, marketer and distributor of floor care, steam cleaning and small kitchen products and appliances. 13.25% Senior Subordinated Note due 2011 $ 1,125,000 09/09/03 $ 1,106,131 $ 112,500 16.03% Overdue Interest Secured Note due 2008 (C) $ 75,952 01/13/06 68,357 68,357 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 23,229 shs. 09/09/03 18,869 -- ------------- ------------- 1,193,357 180,857 ------------- ------------- EVANS CONSOLES, INC. A designer and manufacturer of consoles and control center systems. Common Stock (B) 45,000 shs. 05/06/04 6 -- ------------- ------------- F H S HOLDINGS LLC A national provider of customized disease management services to large, self-insured employers. 12% Senior Subordinated Note due 2014 $ 1,265,625 06/01/06 1,175,806 1,257,724 Preferred Unit (B) 84 uts. 06/01/06 83,530 75,177 Common Unit (B) 844 uts. 06/01/06 844 759 Common Unit Class B (B) 734 shs. 06/01/06 64,779 58,301 ------------- ------------- 1,324,959 1,391,961 ------------- ------------- FLUTES, INC. An independent manufacturer of micro fluted corrugated sheet material for the food and consumer products packaging industries. 10% Senior Secured Term Note due 2013 $ 524,791 04/13/06 516,919 510,804 14% Senior Subordinated Note due 2014 $ 312,674 04/13/06 279,148 305,095 Common Stock (B) 62,535 shs. 04/13/06 62,535 56,282 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 17,680 shs. 04/13/06 27,676 177 ------------- ------------- 886,278 872,358 ------------- ------------- FOWLER HOLDING, INC. A provider of site development services to residential homebuilders and developers in the Raleigh/Durham region of North Carolina. 12% Senior Subordinated Note due 2013 $ 1,252,174 02/03/06 1,126,673 1,210,059 Common Stock (B) 98 shs. 02/03/06 97,826 88,047 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 135 shs. 02/03/06 110,348 1 ------------- ------------- 1,334,847 1,298,107 ------------- ------------- FUEL SYSTEMS HOLDING CORPORATION An independent North American supplier of fuel tanks for a wide variety of commercial vehicles. 12% Senior Subordinated Note due 2014 $ 1,237,500 01/31/06 1,151,428 1,201,319 Common Stock (B) 112,500 shs. 01/31/06 112,500 101,250 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 73,275 shs. 01/31/06 63,113 733 ------------- ------------- 1,327,041 1,303,302 ------------- ------------- --------------------------------------------------------------------------------------------------------------------------------- 12 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- H M HOLDING COMPANY A designer, manufacturer, and importer of promotional and wood furniture. 12% Senior Subordinated Note due 2013 $ 1,170,000 02/10/06 $ 1,086,105 $ 1,134,386 Common Stock (B) 180 shs. 02/10/06 180,000 162,000 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 67 shs. 02/10/06 61,875 1 ------------- ------------- 1,327,980 1,296,387 ------------- ------------- HIGHGATE CAPITAL LLC An acquirer of controlling or substantial interests in manufacturing and marketing entities. Series A Preferred Units (B) 0.30% int. 07/21/94 91,867 737 ------------- ------------- HOME DECOR HOLDING COMPANY A designer, manufacturer and marketer of framed art and wall decor products. 12.5% Senior Subordinated Note due 2012 $ 1,081,731 * 989,598 1,074,605 Common Stock (B) 33 shs. * 33,216 38,120 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 106 shs. * 105,618 121,199 ------------- ------------- 1,128,432 1,233,924 ------------- ------------- INTEGRATION TECHNOLOGY SYSTEMS, INC. A manufacturer of steel protective computer and network systems for the industrial and office environments. 12% Senior Secured Note due 2006 $ 949,004 03/01/04 938,546 711,753 Common Stock (B) 130 shs. 06/01/00 149,500 -- ------------- ------------- 1,088,046 711,753 ------------- ------------- ITC^DELTACOM, INC. A provider of integrated communications services in the southeastern United States. 13.19% Senior Secured Note due 2009 (C) $ 1,174,631 07/26/05 1,151,218 1,164,352 16.69% Senior Secured Note due 2009 (C) $ 187,317 07/26/05 164,572 185,104 Warrant, exercisable until 2009, to purchase convertible preferred stock at $.01 per share (B) 54,468 shs. 07/26/05 18,156 73,532 ------------- ------------- 1,333,946 1,422,988 ------------- ------------- JASON, INC. A diversified manufacturing company serving various industrial markets. 13% Senior Subordinated Note due 2008 $ 510,187 08/04/00 484,580 502,935 14% Cumulative Redeemable Preferred Stock Series A (B) 153 shs. 08/04/00 153,119 149,468 Limited Partnership Interest of Saw Mill Capital Fund II, L.P. (B) 1.30% int. 08/03/00 469,250 375,461 Warrants, exercisable until 2008 and 2009, to purchase common stock at $.01 per share (B) 26,931 shs. 08/04/00 61,101 21,544 ------------- ------------- 1,168,050 1,049,408 ------------- ------------- *06/30/04 and 08/19/04. --------------------------------------------------------------------------------------------------------------------------------- 13 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- JUSTRITE MANUFACTURING ACQUISITION CO. A manufacturer of safety products such as storage cabinets and containers. 12% Senior Subordinated Note due 2011 $ 843,750 12/15/04 $ 797,649 $ 814,482 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 594 shs. 12/15/04 53,528 6 ------------- ------------- 851,177 814,488 ------------- ------------- K N B HOLDINGS CORPORATION A designer, manufacturer and marketer of products for the custom framing market. 13.5% Senior Subordinated Note due 2013 $ 1,278,947 05/25/06 1,215,793 1,250,127 Common Stock (B) 71,053 shs. 05/25/06 71,053 63,948 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 43,600 shs. 05/25/06 37,871 436 ------------- ------------- 1,324,717 1,314,511 ------------- ------------- KEEPSAKE QUILTING, INC. A seller of quilting fabrics, books, patterns, kits and notions to consumers. 8.77% Senior Secured Revolving Note due 2006 (C) $ 20,967 06/16/00 20,967 20,950 8.77% Senior Secured Tranche A Note due 2007 (C) $ 157,255 06/16/00 157,255 155,747 12% Senior Secured Tranche B Note due 2008 $ 314,509 06/16/00 305,433 314,719 Limited Partnership Interest of Riverside XVI Holding Company, L.P. (B) 3.02% int. 06/12/00 190,563 123,761 Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 633 shs. 06/12/00 26,209 41,110 ------------- ------------- 700,427 656,287 ------------- ------------- KELE AND ASSOCIATES, INC. A distributor of building automation control products. 12% Senior Subordinated Note due 2012 $ 969,643 02/27/04 893,467 988,422 Preferred Stock (B) 12 shs. 11/24/04 237,794 241,915 Common Stock (B) 6 shs. 02/27/04 6,814 93,122 Warrant, exercisable until 2012, to purchase common stock at $.02 per share (B) 6 shs. 02/27/04 4,124 85,169 ------------- ------------- 1,142,199 1,408,628 ------------- ------------- KEYSTONE NORTH AMERICA, INC. An operator of funeral homes in North America. Common Stock 28,577 shs. 02/08/05 137,444 172,376 ------------- ------------- LIH INVESTORS, L.P. A manufacturer and marketer of a broad line of external accessories for new and used sport utility vehicles, trucks and vans. 12.5% Senior Subordinated Note due 2008 $ 2,036,000 * 1,893,287 1,980,215 Common Stock (B) 3,057 shs. * 213,998 117,695 Warrant, exercisable until 2006, to purchase common stock at $.11 per share (B) 8,245 shs. * 318,838 317,433 ------------- ------------- 2,426,123 2,415,343 ------------- ------------- *12/23/98 and 01/28/99. --------------------------------------------------------------------------------------------------------------------------------- 14 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- MAGNATECH INTERNATIONAL, INC. A supplier of process equipment and related parts used in the manufacturing of medium and high-pressure reinforced hoses. 12% Senior Subordinated Note due 2014 $ 675,000 04/05/06 $ 627,243 $ 663,755 13% Preferred Stock (B) 299 shs. 04/05/06 299,295 284,335 Common Stock (B) 66 shs. 04/05/06 66,202 62,890 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 7 shs. 04/05/06 6,832 -- ------------- ------------- 999,572 1,010,980 ------------- ------------- MAVERICK ACQUISITION COMPANY A manufacturer of capsules that cover the cork and neck of wine bottles. 9.50% Senior Secured Tranche A Note due 2010 (C) $ 393,837 09/03/04 393,837 393,922 12% Senior Secured Tranche B Note due 2011 $ 179,104 09/03/04 160,327 177,003 Limited Partnership Interest (B) 4.48% int. 09/03/04 33,582 30,224 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 243 shs. 09/03/04 22,556 2 ------------- ------------- 610,302 601,151 ------------- ------------- MAXON CORPORATION A manufacturer of industrial combustion equipment and related shut-off valves and control valves. 12% Senior Subordinated Note due 2012 $ 549,837 09/30/04 505,354 556,603 8.75% Senior Subordinated Note due 2012 $ 732,065 09/30/04 732,065 745,227 Common Stock (B) 218,099 shs. 09/30/04 218,099 394,323 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 87,755 shs. 09/30/04 51,941 158,661 ------------- ------------- 1,507,459 1,854,814 ------------- ------------- MEDASSIST, INC. A provider of patient eligibility and accounts receivable management services to hospitals and physician practices. 8% Preferred Stock (B) 44 shs. 10/28/04 44,289 43,449 Common Stock (B) 13,863 shs. 10/28/04 18,576 38,370 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 47,090 shs. 05/01/03 21,534 130,339 ------------- ------------- 84,399 212,158 ------------- ------------- MICROGROUP, INC. A manufacturer of precision parts and assemblies, and a value-added supplier of metal tubing and bars. 12% Senior Subordinated Note due 2013 $ 1,134,000 08/12/05 1,065,942 1,131,369 Common Stock (B) 216 shs. 08/12/05 216,000 194,400 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 73 shs. 08/12/05 72,576 1 ------------- ------------- 1,354,518 1,325,770 ------------- ------------- --------------------------------------------------------------------------------------------------------------------------------- 15 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- MONESSEN HOLDING CORPORATION A designer and manufacturer of a broad line of gas, wood and electric hearth products and accessories. 12% Senior Subordinated Note due 2014 $ 1,350,000 03/31/06 $ 1,251,105 $ 1,315,807 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 81 shs. 03/31/06 73,125 1 ------------- ------------- 1,324,230 1,315,808 ------------- ------------- MOSS, INC. A manufacturer and distributor of large display and exhibit structures. 9% Senior Secured Tranche A Note due 2010 (C) $ 550,000 12/21/05 544,500 553,318 12% Senior Secured Tranche B Note due 2010 $ 200,000 12/21/05 177,059 199,660 Limited Partnership Interest of Riverside Capital Appreciation Fund I, L.P. (B) 0.01% int. * 29 217,272 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 122 shs. 12/21/05 20,941 1 ------------- ------------- 742,529 970,251 ------------- ------------- NABCO, INC. A producer of explosive containment vessels in the United States. 12% Senior Subordinated Note due 2014 $ 330,882 02/24/06 305,002 320,065 Limited Partnership Interest (B) 344 uts. 02/24/06 344,120 326,914 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 26 shs. 02/24/06 19,687 -- ------------- ------------- 668,809 646,979 ------------- ------------- NEFF MOTIVATION, INC. A manufacturer and distributor of customized awards and sportswear to schools. 12.5% Senior Subordinated Note due 2011 $ 562,500 01/31/03 492,779 573,750 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 112 shs. 01/31/03 95,625 113,859 ------------- ------------- 588,404 687,609 ------------- ------------- NONNI'S FOOD COMPANY A producer and distributor of premium biscotti and bagel chips in North America. 12.25% Senior Subordinated Note due 2012 $ 986,538 03/29/04 982,661 965,429 10% Preferred Stock (B) 135 shs. 03/29/04 135,044 131,670 Common Stock (B) 3,418 shs. 03/29/04 3,418 26,235 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 4,565 shs. 03/29/04 3,877 34,997 ------------- ------------- 1,125,000 1,158,331 ------------- ------------- *09/20/00 and 05/23/02. --------------------------------------------------------------------------------------------------------------------------------- 16 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- NYLONCRAFT, INC. A supplier of engineered plastic components for the automotive industry. 9% Senior Secured Note due 2009 $ 464,286 01/28/02 $ 464,286 $ 453,489 11.5% Senior Subordinated Note due 2012 $ 857,143 01/28/02 793,964 810,952 Common Stock (B) 178,571 shs. 01/28/02 178,571 142,857 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 138,928 shs. 01/28/02 92,597 1,389 ------------- ------------- 1,529,418 1,408,687 ------------- ------------- O R S NASCO HOLDING, INC. A wholesale distributor of industrial supplies in North America. 13% Senior Subordinated Note due 2013 $ 1,256,152 12/20/05 1,180,473 1,223,315 Common Stock (B) 93,848 shs. 12/20/05 93,848 84,463 Warrant, exercisable until 2015, to purchase common stock at $.01 per share (B) 52,820 shs. 12/20/05 52,292 528 ------------- ------------- 1,326,613 1,308,306 ------------- ------------- OAKRIVER TECHNOLOGY, INC. Designs, engineers and assembles high precision automated process equipment for the medical device industry, with a focus on defibrillators and stents. 10% Senior Secured Note due 2012 $ 323,115 01/03/06 318,268 315,859 13% Senior Subordinated Note due 2013 $ 392,709 01/03/06 350,137 382,964 Common Stock (B) 184,176 shs. 01/03/06 184,176 165,758 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 41,249 shs. 01/03/06 35,900 412 ------------- ------------- 888,481 864,993 ------------- ------------- OLYMPIC SALES, INC. A boat retailer in Washington state, Oregon, California and British Columbia. 14% Senior Subordinated Note due 2006 $ 1,241,000 08/07/98 1,241,000 1,236,731 12% Senior Subordinated Note due 2008 $ 244,154 02/09/00 237,103 238,771 Limited Partnership Interest of Riverside VIII, VIII-A and VIII-B Holding Company, L.P. 10.66% int. * 808,300 808,347 Warrants, exercisable until 2007 and 2008, to purchase common stock at $.01 per share (B) 15,166 shs. ** 206,041 204,198 ------------- ------------- 2,492,444 2,488,047 ------------- ------------- ONTARIO DRIVE & GEAR LTD. A manufacturer of all-wheel drive, off-road amphibious vehicles and related accessories. 13% Senior Subordinated Note due 2013 $ 1,047,115 01/17/06 939,648 1,022,182 Limited Partnership Interest (B) 1,942 uts. 01/17/06 302,885 272,597 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 328 shs. 01/17/06 90,424 3 ------------- ------------- 1,332,957 1,294,782 ------------- ------------- *08/07/98, 02/23/99, 12/22/99 and 02/25/03. **08/07/98 and 02/29/00. --------------------------------------------------------------------------------------------------------------------------------- 17 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- OVERTON'S HOLDING COMPANY A marketer of marine and water sports accessories in the United States. 12% Senior Subordinated Note due 2014 $ 962,104 04/28/06 $ 899,081 $ 943,749 Common Stock (B) 50 shs. 04/28/06 50,000 45,000 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 49 shs. 04/28/06 44,322 -- ------------- ------------- 993,403 988,749 ------------- ------------- P I I HOLDING CORPORATION A manufacturer of plastic film and bags for the general industrial, medical, and food industries. 12% Senior Subordinated Note due 2013 $ 1,215,000 03/31/06 1,133,188 1,177,707 Preferred Stock (B) 19 shs. 03/31/06 174,492 165,788 Common Stock (B) 12 shs. 03/31/06 13,500 12,150 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 7 shs. 03/31/06 5,888 -- ------------- ------------- 1,327,068 1,355,645 ------------- ------------- PARADIGM PACKAGING, INC. A manufacturer of plastic bottles and closures for the nutritional, pharmaceutical, personal care and food packaging markets. 12% Senior Subordinated Note due 2008 $ 1,125,000 12/19/00 1,063,333 1,091,994 Membership Interests of MM/Lincap PPI Investments, Inc., LLC (B) 1.28% int. 12/21/00 140,625 148,258 ------------- ------------- 1,203,958 1,240,252 ------------- ------------- PROTEIN GENETICS, INC. A producer of bovine artificial insemination products, related breeding and healthcare products and specialty genetics sold to the dairy and beef industries. 9.8% Redeemable Exchangeable Preferred Stock (B) 332 shs. 08/12/94 33,217 -- Common Stock (B) 867 shs. * 42,365 -- ------------- ------------- 75,582 -- ------------- ------------- QUALIS AUTOMOTIVE LLC A distributor of aftermarket automotive brake and chassis products. 12% Senior Subordinated Note due 2012 $ 937,500 05/28/04 774,396 950,027 Common Stock 187,500 shs. 05/28/04 187,500 345,938 Warrant, exercisable until 2012, to purchase common stock at $.01 per share 199,969 shs. 05/28/04 199,969 368,943 ------------- ------------- 1,161,865 1,664,908 ------------- ------------- QUALSERV CORPORATION A provider of foodservice equipment and supplies to major restaurant chains and their franchisees. 14% Senior Subordinated Note due 2012 (D) $ 1,002,475 07/09/04 976,254 601,485 Limited Partnership Interest (B) 4.90% int. 07/09/04 137,195 -- Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 280 shs. 07/09/04 25,973 -- ------------- ------------- 1,139,422 601,485 ------------- ------------- *11/14/01 and 08/12/94. --------------------------------------------------------------------------------------------------------------------------------- 18 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- RADIAC ABRASIVES, INC. A manufacturer of bonded abrasive and super abrasive grinding wheels in the United States. 12% Senior Subordinated Note due 2014 $ 1,196,809 02/10/06 $ 1,112,138 $ 1,164,004 Common Stock (B) 153,191 shs. 02/10/06 153,191 137,872 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 69,647 shs. 02/10/06 63,421 696 ------------- ------------- 1,328,750 1,302,572 ------------- ------------- RIVER RANCH FRESH FOODS LLC A supplier of fresh produce to the retail and foodservice channels. 13% Senior Subordinated Note due 2011 (D) $ 975,000 09/29/04 891,404 877,500 Limited Partnership Interest (B) 21,500 uts. 09/29/04 150,000 -- Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 12,481 shs. 09/29/04 83,596 -- ------------- ------------- 1,125,000 877,500 ------------- ------------- ROYAL BATHS MANUFACTURING COMPANY A manufacturer and distributor of acrylic and cultured marble bathroom products. 12.5% Senior Subordinated Note due 2011 $ 562,500 11/14/03 511,381 558,073 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 74 shs. 11/14/03 65,089 37,756 ------------- ------------- 576,470 595,829 ------------- ------------- SAFETY SPEED CUT MANUFACTURING COMPANY, INC. A manufacturer of vertical panel saws and routers for the wood working industry. 8.73% Senior Secured Tranche A Note due 2007 (C) $ 323,044 06/02/99 323,044 323,044 12% Senior Secured Tranche B Note due 2007 $ 646,089 06/02/99 646,089 646,089 Class B Common Stock (B) 846 shs. 06/02/99 146,456 284,391 ------------- ------------- 1,115,589 1,253,524 ------------- ------------- SAVAGE SPORTS HOLDING, INC. A manufacturer of sporting firearms. 12% Senior Subordinated Note due 2012 $ 814,655 09/10/04 762,530 797,106 Common Stock (B) 310 shs. 09/10/04 310,345 253,171 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 71 shs. 09/10/04 60,129 57,706 ------------- ------------- 1,133,004 1,107,983 ------------- ------------- SPECIALTY FOODS GROUP, INC. A manufacturer and distributor of branded meat products. Limited Partnership Interest of MHD Holdings LLC (B) 0.76% int. 08/29/00 307,860 -- ------------- ------------- STRATEGIC EQUIPMENT & SUPPLY CORPORATION, INC. A provider of kitchen and restaurant design, equipment fabrication and installation services. Warrant, exercisable until 2008, to purchase common stock at $.01 per share (B) 61,862 shs. 01/14/00 382,501 -- ------------- ------------- --------------------------------------------------------------------------------------------------------------------------------- 19 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- SYNVENTIVE EQUITY LLC A manufacturer of hot runner systems used in the plastic injection molding process. Limited Partnership Interest (B) 1.05% int. 08/20/03 $ 33,463 $ 7,465 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 45,942 shs. 08/21/03 10,249 10,249 ------------- ------------- 43,712 17,714 ------------- ------------- TANGENT RAIL CORPORATION A manufacturer of rail ties and provides specialty services to the North American railroad industry. 13% Senior Subordinated Note due 2013 $ 1,173,909 10/14/05 1,002,642 1,185,887 Preferred Stock (B) 1,749 shs. 10/14/05 174,924 176,168 Common Stock (B) 1,167 shs. 10/14/05 1,167 1,050 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 618 shs. 10/14/05 155,860 6 ------------- ------------- 1,334,593 1,363,111 ------------- ------------- TERRA RENEWAL SERVICES, INC. A provider of wastewater residual management and required environmental reporting, permitting, nutrient management planning and record keeping to companies involved in poultry and food processing 10% Senior Secured Tranche A Note due 2011 (C) $ 281,250 04/28/06 280,428 277,237 10.25% Senior Secured Tranche B Note due 2012 (C) $ 421,874 04/28/06 420,802 411,663 12% Senior Subordinated Note due 2014 $ 664,062 04/28/06 631,316 651,792 Limited Partnership Interest of Saw Mill Capital Fund V, L.P. 2.30% int. 03/01/05 123,284 110,955 Warrant, exercisable until 2016, to purchase common stock at $.01 per share (B) 41 shs. 04/28/06 34,627 -- ------------- ------------- 1,490,457 1,451,647 ------------- ------------- THE TRANZONIC COMPANIES A producer of commercial and industrial supplies, such as safety products, janitorial supplies, work apparel, washroom and restroom supplies and sanitary care products. 13% Senior Subordinated Note due 2009 $ 1,356,000 02/05/98 1,274,401 1,356,000 Common Stock (B) 315 shs. 02/04/98 315,000 313,713 Warrant, exercisable until 2006, to purchase common stock at $.01 per share (B) 222 shs. 02/05/98 184,416 221,093 ------------- ------------- 1,773,817 1,890,806 ------------- ------------- TRANSTAR HOLDING COMPANY A distributor of aftermarket automotive transmission parts. 12% Senior Subordinated Note due 2013 $ 918,000 08/31/05 879,077 915,020 Common Stock (B) 432 shs. 08/31/05 432,000 410,400 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 46 shs. 08/31/05 41,021 -- ------------- ------------- 1,352,098 1,325,420 ------------- ------------- --------------------------------------------------------------------------------------------------------------------------------- 20 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- TRONAIR, INC. A designer, engineer and manufacturer of ground support equipment for the business, commuter and commercial aviation markets. 10.5% Senior Secured Term Note due 2008 $ 451,394 01/20/00 $ 451,394 $ 451,615 12% Senior Subordinated Note due 2010 $ 758,100 01/20/00 732,202 759,616 Common Stock (B) 129,960 shs. 01/20/00 129,960 298,258 Warrant, exercisable until 2010, to purchase common stock at $1 per share (B) 148,912 shs. 01/20/00 56,316 341,751 ------------- ------------- 1,369,872 1,851,240 ------------- ------------- TRUCK BODIES & EQUIPMENT INTERNATIONAL A designer and manufacturer of accessories for heavy and medium duty trucks, primarily dump bodies, hoists, various forms of flat-bed bodies, landscape bodies and other accessories. 12% Senior Subordinated Note due 2013 $ 1,222,698 * 1,138,840 1,241,643 Common Stock (B) 393 shs. * 423,985 531,803 Warrant, exercisable until 2013, to purchase common stock at $.01 per share (B) 81 shs. * 84,650 109,826 ------------- ------------- 1,647,475 1,883,272 ------------- ------------- TRUSTILE DOORS, INC. A manufacturer and distributor of interior doors. 12.5% Senior Subordinated Note due 2010 $ 562,500 04/11/03 529,182 559,061 Warrant, exercisable until 2010, to purchase common stock at $.01 per share (B) 3,060 shs. 04/11/03 50,625 37,984 ------------- ------------- 579,807 597,045 ------------- ------------- TUBULAR TEXTILE MACHINERY A designer, manufacturer, sale and servicer of finishing machinery for the knit and woven segments of the global textile industry. 12% Senior Subordinated Note due 2014 $ 705,457 05/28/04 640,876 684,884 8.75% Senior Secured Note due 2011 $ 409,310 05/28/04 409,310 404,053 Common Stock (B) 385,233 shs. 05/28/04 385,233 327,448 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 116,521 shs. 05/28/04 74,736 1,165 ------------- ------------- 1,510,155 1,417,550 ------------- ------------- TVI, INC. A retailer of used clothing in the United States, Canada and Australia. Common Stock (B) 187,500 shs. 05/02/00 187,500 579,375 ------------- ------------- U S M HOLDINGS CORPORATION A provider of facility maintenance services to retail and corporate clients with multiple locations. 12% Senior Subordinated Note due 2011 $ 473,684 08/06/03 413,196 473,684 Preferred Stock (B) 1,361 shs. 08/06/03 136,089 139,398 Common Stock (B) 546 shs. 08/06/03 546 821,916 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 502 shs. 08/06/03 157,869 516,922 ------------- ------------- 707,700 1,951,920 ------------- ------------- *07/19/05 and 12/22/05. --------------------------------------------------------------------------------------------------------------------------------- 21 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares, Units, Warrants, Ownership or Principal Acquisition CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Amount Date Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- U S S HOLDINGS, INC. A producer of high grade industrial and specialty silica sands. 14% Redeemable Preferred Stock (B) 499 shs. 09/30/99 $ 272,912 $ 54,525 Convertible Preferred Stock Series A and B, convertible into common stock at $9.26 per share (B) 72,720 shs. 12/19/96 583,365 -- Common Stock (B) 10,013 shs. 09/30/99 399,505 -- Warrants, exercisable until 2010, to purchase common stock at $.01 per share (B) 2,459 shs. * 64,182 -- ------------- ------------- 1,319,964 54,525 ------------- ------------- U-LINE CORPORATION A manufacturer of high-end, built-in, undercounter icemaking, wine storage and refrigeration appliances. 12.5% Senior Subordinated Note due 2012 $ 996,500 04/30/04 902,533 1,008,844 Common Stock (B) 96 shs. 04/30/04 96,400 121,464 Warrant, exercisable until 2012, to purchase common stock at $.01 per share (B) 122 shs. 04/30/04 112,106 153,720 ------------- ------------- 1,111,039 1,284,028 ------------- ------------- VICTORY VENTURES LLC An acquirer of controlling or substantial interests in other entities. Series A Preferred Units (B) 0.04% int. 12/02/96 1 2 ------------- ------------- VITALITY FOODSERVICE, INC. A non-carbonated beverage dispensing company focused on the foodservice industry. 13% Senior Subordinated Note due 2011 $ 999,153 09/24/04 916,370 979,337 Common Stock (B) 12,585 shs. 09/24/04 125,850 172,767 Warrant, exercisable until 2011, to purchase common stock at $.01 per share (B) 12,593 shs. 09/24/04 98,938 172,877 ------------- ------------- 1,141,158 1,324,981 ------------- ------------- VITEX PACKAGING GROUP, INC. A manufacturer of specialty packaging, primarily envelopes and tags used on tea bags. 12.5% Senior Subordinated Note due 2012 $ 900,000 07/19/04 785,153 839,562 Limited Partnership Interest Class A (B) 0.93% int. 07/19/04 219,375 197,438 Limited Partnership Interest Class B (B) 0.41% int. 07/19/04 96,848 87,163 ------------- ------------- 1,101,376 1,124,163 ------------- ------------- WALLS INDUSTRIES, INC. A provider of branded workwear and sporting goods apparel. 10% Senior Subordinated Lien Note due 2009 $ 444,079 07/12/04 444,079 449,272 14% Senior Subordinated Note due 2012 $ 563,346 07/12/04 561,860 579,449 Limited Partnership Interest (B) 0.20% int. 07/12/04 19,737 461,846 Warrant, exercisable until 2014, to purchase common stock at $.01 per share (B) 2,133 shs. 07/12/04 1,500 49,918 ------------- ------------- 1,027,176 1,540,485 ------------- ------------- TOTAL PRIVATE PLACEMENT INVESTMENTS $ 89,900,538 $ 91,548,868 ------------- ------------- *12/19/96 and 09/30/99. --------------------------------------------------------------------------------------------------------------------------------- 22 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares or Interest Due Principal CORPORATE RESTRICTED SECURITIES (A) (CONTINUED) Rate Date Amount Cost Fair Value --------------------------------------------------------------------------------------------------------------------------------- RULE 144A SECURITIES - 4.60%: (A) BONDS - 4.60% A E S Corporation 8.750% 05/15/13 $ 425,000 $ 470,893 $ 454,750 A E S Corporation 9.000 05/15/15 175,000 175,000 188,125 Atlas Pipeline Partners 8.125 12/15/15 100,000 100,000 99,625 Basic Energy Services 7.125 04/15/16 125,000 125,000 116,250 Bombardier, Inc. 6.300 05/01/14 500,000 440,315 435,000 Charter Communications Op LLC 8.000 04/30/12 500,000 498,750 497,500 Douglas Dynamics LLC 7.750 01/15/12 325,000 326,738 308,750 Dynegy Holdings, Inc. 8.375 05/01/16 165,000 165,000 162,525 Edison Mission Energy 7.750 06/15/16 235,000 235,000 230,888 G F S I, Inc. 11.000 06/01/11 375,000 340,343 354,375 Interactive Health LLC 7.250 04/01/11 484,000 412,282 397,485 Neiman Marcus Group, Inc. 10.375 10/15/15 600,000 600,000 637,500 Packaging Corporation of America 10.000 05/01/16 350,000 350,000 350,000 Petrohawk Energy Corporation 9.125 07/15/13 275,000 271,521 271,521 Service Corporation International (C) 8.000 06/15/17 500,000 495,015 467,500 Siebe PLC 6.500 01/15/10 350,000 308,000 358,552 Stewart & Stevenson LLC 10.000 07/15/14 100,000 100,000 100,375 Sungard Data Systems 9.125 08/15/13 75,000 75,000 77,813 T C W Lev Income Trust LP 8.410 11/30/06 452,859 452,859 298,524 Tenaska Alabama Partners LP 7.000 06/30/21 180,789 180,789 176,199 ------------ ------------ TOTAL BONDS 6,122,505 5,983,257 ------------ ------------ WARRANTS - 0.00% Winsloew Furniture, Inc. (B) 700 $ 7 $ -- ------------ ------------ TOTAL WARRANTS 7 -- ------------ ------------ TOTAL RULE 144A SECURITIES 6,122,512 5,983,257 ------------ ------------ TOTAL CORPORATE RESTRICTED SECURITIES $ 96,023,050 $ 97,532,125 ------------ ------------ --------------------------------------------------------------------------------------------------------------------------------- 23 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Interest Due Principal CORPORATE PUBLIC SECURITIES - 22.96%: (A) Rate Date Amount Cost Market Value --------------------------------------------------------------------------------------------------------------------------------- BONDS - 21.91% Abitibi-Consolidated, Inc. 7.750% 06/15/11 $ 500,000 $ 514,778 $ 458,750 Allied Waste NA 7.875 04/15/13 500,000 513,581 500,000 Appleton Papers, Inc. 8.125 06/15/11 250,000 250,000 252,500 Argo Tech Corporation 9.250 06/01/11 425,000 425,000 437,750 Arrow Electronics, Inc. 7.000 01/15/07 500,000 507,160 503,020 BCP Crystal US Holdings Corporation 9.625 06/15/14 355,000 355,000 385,175 Blockbuster, Inc. 10.000 09/01/12 275,000 276,398 256,438 C S C Holdings, Inc. 7.625 04/01/11 250,000 250,871 250,000 Cablevision Systems Corporation (C) 9.620 04/01/09 450,000 450,000 477,000 Cadmus Communications Corporation 8.375 06/15/14 350,000 350,000 346,500 Chemed Corporation 8.750 02/24/11 600,000 600,000 630,000 Chesapeake Energy Corporation 7.000 08/15/14 650,000 675,304 628,875 Cincinnati Bell, Inc. 8.375 01/15/14 550,000 503,750 541,750 Clayton Williams Energy, Inc. 7.750 08/01/13 375,000 375,000 345,000 Del Monte Corporation 8.625 12/15/12 200,000 200,000 206,000 Dollar Financial Group 9.750 11/15/11 325,000 325,000 349,375 Dominos Pizza, Inc. 8.250 07/01/11 109,000 108,213 113,088 Electronic Data Systems Corporation 7.125 10/15/09 500,000 504,526 516,375 Esterline Technologies 7.750 06/15/13 175,000 175,000 177,188 Ford Motor Credit Co. 5.800 01/12/09 500,000 499,070 456,784 Ford Motor Credit Co. 7.375 10/28/09 750,000 748,125 693,404 Gencorp, Inc. 9.500 08/15/13 130,000 130,000 138,125 General Motors Acceptance Corporation 5.850 01/14/09 750,000 742,759 718,953 Goodyear Tire & Rubber Co. 7.857 08/15/11 350,000 327,250 324,625 GulfMark Offshore, Inc. 7.750 07/15/14 300,000 298,725 292,500 Houghton Mifflin Co. 9.875 02/01/13 500,000 526,686 518,750 Huntsman LLC 11.625 10/15/10 163,000 161,068 180,115 Imax Corporation 9.625 12/01/10 500,000 515,710 512,500 Inergy LP 8.250 03/01/16 75,000 75,000 75,750 Intelsat Subsidiary Holding Company Ltd. (C) 9.614 01/15/12 225,000 224,998 227,250 Interline Brands, Inc. 8.125 06/15/14 150,000 148,925 149,625 Intrawest Corporation 7.500 10/15/13 250,000 250,000 248,750 K 2, Inc. 7.375 07/01/14 150,000 150,554 144,000 Koppers Inc. 9.875 10/15/13 170,000 170,000 182,325 Lazard LLC 7.125 05/15/15 375,000 374,704 378,994 Leucadia National Corporation 7.000 08/15/13 350,000 356,288 339,500 Liberty Media Corporation 5.700 05/15/13 500,000 475,805 454,066 Lodgenet Entertainment Corporation 9.500 06/15/13 375,000 375,000 399,375 Lyondell Chemical Co. 9.500 12/15/08 265,000 258,511 272,288 M G M Mirage, Inc. 6.000 10/01/09 225,000 227,300 218,813 Mac-Gray Corporation 7.625 08/15/15 300,000 300,000 303,000 Magnachip Semiconductor 8.000 12/15/14 50,000 50,000 41,500 Majestic Star Casino LLC 9.500 10/15/10 250,000 250,000 261,875 Manitowoc Company, Inc. 7.125 11/01/13 100,000 100,000 98,000 Markwest Energy Operating Co. 6.875 11/01/14 250,000 250,000 230,000 Mediacom LLC 9.500 01/15/13 750,000 745,723 746,250 Metaldyne Corporation 10.000 11/01/13 340,000 341,977 328,950 Moog, Inc. 6.250 01/15/15 60,000 60,000 56,400 N R G Energy, Inc. 7.375 02/01/16 100,000 100,000 97,500 Nalco Co. 7.750 11/15/11 250,000 250,000 249,375 --------------------------------------------------------------------------------------------------------------------------------- 24 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Interest Due Principal CORPORATE PUBLIC SECURITIES (A) (CONTINUED) Rate Date Amount Cost Market Value --------------------------------------------------------------------------------------------------------------------------------- BONDS, CONTINUED National Wine & Spirits, Inc. 10.125 01/15/09 $ 25,000 $ 25,283 $ 25,000 Nextel Communications, Inc. 7.375 08/01/15 400,000 409,377 407,151 North American Energy Partners 8.750 12/01/11 200,000 200,000 192,000 Nova Chemicals Corporation (C) 8.405 11/15/13 215,000 215,000 213,388 O E D Corp/Diamond Jo Company Guarantee 8.750 04/15/12 500,000 492,980 503,125 Offshore Logistics, Inc. 6.125 06/15/13 350,000 350,000 322,875 P Q Corporation 7.750 02/15/13 685,000 677,350 643,900 Pacific Energy Partners 7.125 06/15/14 250,000 251,953 252,500 Pacific Energy Partners 6.250 09/15/15 100,000 99,544 97,000 Pinnacle Foods Group 8.250 12/01/13 225,000 225,000 221,063 Pliant Corporation 11.625 06/15/09 607,802 619,825 657,946 Primedia, Inc. 8.000 05/15/13 500,000 513,690 447,500 Quicksilver Resources, Inc. 7.125 04/01/16 225,000 225,000 210,938 Rent-A-Center, Inc. 7.500 05/01/10 250,000 250,000 248,750 Rent-Way, Inc. 11.875 06/15/10 450,000 466,571 462,931 Rock-Tenn Co. 8.200 08/15/11 500,000 503,539 500,000 Rogers Wireless, Inc. 7.250 12/15/12 90,000 90,000 90,675 Rogers Wireless, Inc. 7.500 03/15/15 560,000 600,328 565,600 Rogers Wireless, Inc. 8.000 12/15/12 90,000 90,000 92,025 Samsonite Corporation 8.875 06/01/11 500,000 523,249 518,750 Sheridan Acquisition Corporation 10.250 08/15/11 225,000 222,001 228,656 Sierra Pacific Resources 6.750 08/15/17 330,000 331,618 311,791 Tekni-Plex, Inc. 12.750 06/15/10 500,000 483,500 352,500 Telex Communications, Inc. 11.500 10/15/08 250,000 250,000 263,750 Tenet Healthcare Corporation 6.375 12/01/11 250,000 241,250 223,125 Tenet Healthcare Corporation 9.875 07/01/14 350,000 341,859 350,000 Texas Industries, Inc. 7.250 07/15/13 35,000 35,000 34,650 Transmontaigne, Inc. 9.125 06/01/10 275,000 270,288 292,875 Triton P C S, Inc. 8.500 06/01/13 500,000 500,000 458,750 Tyco International Group SA 6.375 10/15/11 150,000 148,500 153,057 Unisys Corporation 8.000 10/15/12 90,000 90,000 83,700 United Components, Inc. 9.375 06/15/13 535,000 536,395 526,975 United Rentals, Inc. 7.750 11/15/13 325,000 325,000 308,750 Universal City Florida (C) 9.899 05/01/10 100,000 100,000 103,250 Universal City Florida 8.375 05/01/10 100,000 100,000 100,500 Utilicorp United, Inc. (C) 9.950 02/01/11 25,000 27,130 28,140 Vicorp Restaurants, Inc. 10.500 04/15/11 225,000 220,135 200,250 Vought Aircraft Industries 8.000 07/15/11 650,000 648,891 588,250 Warner Music Group 7.375 04/15/14 125,000 125,000 121,250 Wornick Co. 10.875 07/15/11 350,000 350,000 352,625 ------------ ------------ TOTAL BONDS 29,019,015 28,470,087 ------------ ------------ --------------------------------------------------------------------------------------------------------------------------------- 25 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Shares or Interest Due Principal CORPORATE PUBLIC SECURITIES (A) (CONTINUED) Rate Date Amount Cost Market Value --------------------------------------------------------------------------------------------------------------------------------- COMMON STOCK - 0.41% Aventine Renewable Energy (B) 200 $ 8,600 $ 7,780 Basin Water, Inc. (B) 1,100 13,200 11,022 Distributed Energy Systems Corporation (B) 14,000 177,078 72,380 Dyncorp International, Inc. (B) 4,000 60,000 41,520 Gmarket, Inc. (B) 200 3,050 3,074 J Crew Group, Inc. (B) 2,100 42,000 57,645 Rent-Way, Inc. (B) 46,432 458,123 342,668 Theravance, Inc. (B) 3 23 69 ------------ ------------ TOTAL COMMON STOCK 762,074 536,158 ------------ ------------ CONVERTIBLE BONDS - 0.64% Citadel Broadcasting Corporation 1.875% 02/15/11 $ 300,000 $ 232,875 $ 246,000 ICOS Corporation 2.000 07/01/23 375,000 298,125 306,563 Q L T, Inc. 3.000 09/15/23 305,000 277,410 275,263 ------------ ------------ TOTAL CONVERTIBLE BONDS 808,410 827,826 ------------ ------------ TOTAL CORPORATE PUBLIC SECURITIES $ 30,589,499 $ 29,834,071 ------------ ------------ Interest Due Principal Short-Term Securities: Rate/Yield Date Amount Cost Market Value --------------------------------------------------------------------------------------------------------------------------------- COMMERCIAL PAPER - 7.08% Cadbury Schweppes Finance PLC 5.356% 07/03/06 $ 1,569,000 $ 1,568,534 $ 1,568,534 Centex Corporation 5.743 07/11/06 1,380,000 1,377,922 1,377,922 DaimlerChrysler NA Holding Corporation 5.406 07/06/06 1,222,000 1,221,084 1,221,084 Dow Jones & Company, Inc. 5.408 07/10/06 535,000 534,278 534,278 General Mills, Inc. 5.406 07/07/06 2,500,000 2,497,750 2,497,750 Textron Financial Corporation 5.356 07/05/06 2,000,000 1,998,810 1,998,810 ------------ ------------ TOTAL SHORT-TERM SECURITIES $ 9,198,378 $ 9,198,378 ------------ ------------ TOTAL INVESTMENTS 105.10% $135,810,927 $136,564,574 ============ ------------ Other Assets 5.07 6,581,646 Liabilities (10.17) (13,213,287) ------ ------------ TOTAL NET ASSETS 100.00% $129,932,933 ====== ============ (A) In each of the convertible note, warrant, convertible preferred and common stock investments, the issuer has agreed to provide certain registration rights. (B) Non-income producing security. (C) Variable rate security; rate indicated is as of 06/30/06. (D) Defaulted security; interest not accrued. SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. --------------------------------------------------------------------------------------------------------------------------------- 26 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Fair Value/ Fair Value/ Industry Classification: Market Value Market Value ------------------------------------------------------------ ------------------------------------------------------------ AEROSPACE - 2.35% BUILDINGS & REAL ESTATE - 1.57% Argo Tech Corporation $ 437,750 Adorn, Inc. $ 1,402,171 Bombardier, Inc. 435,000 Texas Industries, Inc. 34,650 Consolidated Foundries Holdings 1,372,116 TruStile Doors, Inc. 597,045 Dyncorp International, Inc. 41,520 ------------ Esterline Technologies 177,188 2,033,866 Vought Aircraft Industries 588,250 ------------ ------------ CHEMICAL, PLASTICS & RUBBER - 1.17% 3,051,824 Capital Specialty Plastics, Inc. 27,704 ------------ Huntsman LLC 180,115 AUTOMOBILE - 8.06% Koppers, Inc. 182,325 Gencorp, Inc. 138,125 Lyondell Chemical Co. 272,288 Goodyear Tire & Rubber Co. 324,625 Nova Chemicals Corporation 213,388 Jason, Inc. 1,049,408 P Q Corporation 643,900 LIH Investors, L.P. 2,415,343 ------------ Metaldyne Corporation 328,950 1,519,720 Nyloncraft, Inc. 1,408,687 ------------ Ontario Drive & Gear Ltd. 1,294,782 CONSUMER PRODUCTS - 9.00% Qualis Automotive LLC 1,664,908 Appleton Papers, Inc. 252,500 Transtar Holding Company 1,325,420 Augusta Sportswear Holding Co. 1,521,520 United Components, Inc. 526,975 Bravo Sports Holding Corporation 1,312,822 ------------ Euro-Pro Corporation 180,857 10,477,223 Flutes, Inc. 872,358 ------------ G F S I, Inc. 354,375 BEVERAGE, DRUG & FOOD - 4.22% K 2, Inc. 144,000 Beta Brands Ltd. -- K N B Holdings Corporation 1,314,511 Cains Foods, L.P. 161,905 Maverick Acquisition Company 601,151 Del Monte Corporation 206,000 Royal Baths Manufacturing Company 595,829 Dominos Pizza, Inc. 113,088 Savage Sports Holding, Inc. 1,107,983 Eagle Pack Pet Foods, Inc. 847,424 The Tranzonic Companies 1,890,806 National Wine & Spirits, Inc. 25,000 Walls Industries, Inc. 1,540,485 Nonni's Food Company 1,158,331 Winsloew Furniture, Inc. -- Pinnacle Foods Group 221,063 ------------ River Ranch Fresh Foods LLC 877,500 11,689,197 Specialty Foods Group, Inc. -- ------------ Vicorp Restaurants, Inc. 200,250 CONTAINERS, PACKAGING & GLASS - 4.41% Vitality Foodservice, Inc. 1,324,981 NABCO, Inc. 646,979 Wornick Co. 352,625 P I I Holding Corporation 1,355,645 ------------ Packaging Corporation of America 350,000 5,488,167 Paradigm Packaging, Inc. 1,240,252 ------------ Pliant Corporation 657,946 BROADCASTING & Tekni-Plex, Inc. 352,500 ENTERTAINMENT - 2.36% Vitex Packaging, Inc. 1,124,163 C S C Holdings, Inc. 250,000 ------------ Cablevision Systems Corporation 477,000 5,727,485 Charter Communications Op LLC 497,500 ------------ Citadel Broadcasting Corporation 246,000 DISTRIBUTION - 2.95% Liberty Media Corporation 454,066 Corvest Group, Inc. 511,359 Lodgenet Entertainment Corporation 399,375 Kele and Associates, Inc. 1,408,628 Mediacom LLC 746,250 O R S Nasco Holding, Inc. 1,308,306 ------------ QualServ Corporation 601,485 3,070,191 Strategic Equipment & Supply Corporation, Inc. -- ------------ ------------ 3,829,778 ------------ ---------------------------------------------------------------------------------------------------------------------------------- 27 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Fair Value/ Fair Value/ Industry Classification: (Cont.) Market Value Market Value ------------------------------------------------------------ ------------------------------------------------------------ DIVERSIFIED/CONGLOMERATE, FINANCIAL SERVICES - 2.79% MANUFACTURING - 8.52% BCP Crystal US Holding Corporation $ 385,175 AmerCable, Inc. $ 750,955 Dollar Financial Group 349,375 Arrow Tru-Line Holdings, Inc. 1,302,314 East River Ventures I, L.P. 2,027 Coining Corporation of America LLC 1,105,201 Ford Motor Credit Co. 1,150,188 Dexter Magnetics Technologies, Inc. 642,592 General Motors Acceptance Corporation 718,953 Douglas Dynamics LLC 308,750 Highgate Capital LLC 737 Evans Consoles, Inc. -- Lazard LLC 378,994 H M Holding Company 1,296,387 Leucadia National Corporation 339,500 Justrite Manufacturing Acquisition Co. 814,488 T C W Leveraged Income Trust, L.P. 298,524 Magnatech International, Inc. 1,010,980 Victory Ventures LLC 2 Radiac Abrasives, Inc. 1,302,572 ------------ Rock-Tenn Co. 500,000 3,623,475 Truck Bodies & Equipment International 1,883,272 ------------ Tyco International Group SA 153,057 HEALTHCARE, EDUCATION ------------ & CHILDCARE - 4.28% 11,070,568 A T I Acquisition Company 995,949 ------------ American Hospice Management Holding LLC 1,404,007 DIVERSIFIED/CONGLOMERATE, F H S Holdings LLC 1,391,961 SERVICE - 7.58% ICOS Corporation 306,563 Abitibi-Consolidated, Inc. 458,750 Interactive Health LLC 397,485 Allied Waste NA 500,000 MedAssist, Inc. 212,158 CapeSuccess LLC 2,512 Q L T, Inc. 275,263 Chemed Corporation 630,000 Tenet Healthcare Corporation 573,125 Diversco, Inc./DHI Holdings, Inc. 1,252,858 Theravance, Inc. 69 Dwyer Group, Inc. 1,487,856 ------------ Fowler Holding, Inc. 1,298,107 5,556,580 Gmarket, Inc. 3,074 ------------ Interline Brands, Inc. 149,625 HOME & OFFICE FURNISHINGS, Keystone North America, Inc. 172,376 HOUSEWARES, AND DURABLE Mac-Gray Corporation 303,000 CONSUMER PRODUCTS - 4.08% Moss, Inc. 970,251 Connor Sport Court International, Inc. 954,507 Service Corporation International 467,500 Home Decor Holding Company 1,233,924 U S M Holdings Corporation 1,951,920 Monessen Holding Corporation 1,315,808 Universal City Florida 203,750 Samsonite Corporation 518,750 ------------ U-Line Corporation 1,284,028 9,851,579 ------------ ------------ 5,307,017 ELECTRONICS - 3.00% ------------ A E S Corporation 642,875 LEISURE, AMUSEMENT, Arrow Electronics, Inc. 503,020 ENTERTAINMENT - 2.70% Directed Electronics, Inc. 1,797,881 IMAX Corporation 512,500 Distributed Energy Systems 72,380 Intrawest Corporation 248,750 Electronic Data Systems Corporation 516,375 Keepsake Quilting, Inc. 656,287 Siebe PLC 358,552 M G M Mirage, Inc. 218,813 ------------ Majestic Star Casino LLC 261,875 3,891,083 O E D Corp/Diamond Jo Company Guarantee 503,125 ------------ Overton's Holding Company 988,749 FARMING & AGRICULTURE - 0.00% Warner Music Group 121,250 Protein Genetics, Inc. -- ------------ ------------ 3,511,349 ------------ ---------------------------------------------------------------------------------------------------------------------------------- 28 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Fair Value/ Fair Value/ Industry Classification: (Cont.) Market Value Market Value ------------------------------------------------------------ ------------------------------------------------------------ MACHINERY - 6.78% PHARMACEUTICALS - 1.05% Basin Water, Inc. $ 11,022 CorePharma LLC $ 1,313,435 C & M Conveyor, Inc. 1,498,194 Enzymatic Therapy, Inc. 56,250 Integration Technology Systems, Inc. 711,753 ------------ Manitowoc Company, Inc. 98,000 1,369,685 Maxon Corporation 1,854,814 ------------ Safety Speed Cut Manufacturing Company, Inc. 1,253,524 PUBLISHING/PRINTING - 1.19% Stewart & Stevenson LLC 100,375 Cadmus Communications Corporation 346,500 Synventive Equity LLC 17,714 Houghton Mifflin Co. 518,750 Tronair, Inc. 1,851,240 Primedia, Inc. 447,500 Tubular Textile Machinery 1,417,550 Sheridan Acquisition Corporation 228,656 ------------ ------------ 8,814,186 1,541,406 ------------ ------------ MEDICAL DEVICES/BIOTECH - 3.46% RETAIL STORES - 4.67% Beacon Medical Products, Inc. 1,508,809 Blockbuster, Inc. 256,438 Coeur, Inc. 723,478 J Crew Group, Inc. 57,645 E X C Acquisition Corporation 78,808 Neff Motivation, Inc. 687,609 MicroGroup, Inc. 1,325,770 Neiman Marcus Group, Inc. 637,500 OakRiver Technology, Inc. 864,993 Olympic Sales, Inc. 2,488,047 ------------ Rent-A-Center, Inc. 248,750 4,501,858 Rent-Way, Inc. 805,599 ------------ TVI, Inc. 579,375 MINING, STEEL, IRON & United Rentals, Inc. 308,750 NON PRECIOUS METALS - 0.04% ------------ U S S Holdings, Inc. 54,525 6,069,713 ------------ ------------ OIL AND GAS - 4.80% TECHNOLOGY - 0.16% Aventine Renewable Energy 7,780 Magnachip Semiconductor 41,500 Basic Energy Services 116,250 Sungard Data Systems 77,813 C & J Spec-Rent Services, Inc. 2,176,402 Unisys Corporation 83,700 Chesapeake Energy Corporation 628,875 ------------ Clayton Williams Energy, Inc. 345,000 203,013 Fuel Systems Holding Corporation 1,303,302 ------------ GulfMark Offshore, Inc. 292,500 TELECOMMUNICATIONS - 3.13% North American Energy Partners 192,000 Cincinnati Bell, Inc. 541,750 Offshore Logistics, Inc. 322,875 Intelsat Subsidiary Holding Company Ltd. 227,250 Pacific Energy Partners 349,500 ITC^DeltaCom, Inc. 1,422,988 Quicksilver Resources, Inc. 210,938 Nextel Communications, Inc. 407,151 Transmontaigne, Inc. 292,875 Rogers Wireless, Inc. 748,300 ------------ Telex Communications, Inc. 263,750 6,238,297 Triton P C S, Inc. 458,750 ------------ ------------ 4,069,939 ------------ TRANSPORTATION - 1.05% Tangent Rail Corporation 1,363,111 ------------ ---------------------------------------------------------------------------------------------------------------------------------- 29 CONSOLIDATED SCHEDULE OF INVESTMENTS (CONT.) MASSMUTUAL PARTICIPATION INVESTORS June 30, 2006 (Unaudited) Fair Value/ Industry Classification: (Cont.) Market Value ------------------------------------------------------------ UTILITIES - 1.53% Atlas Pipeline Partners $ 99,625 Dynegy Holdings, Inc. 162,525 Edison Mission Energy 230,888 Inergy LP 75,750 Markwest Energy Operating Co. 230,000 Moog, Inc. 56,400 N R G Energy, Inc. 97,500 Nalco Co. 249,375 Petrohawk Energy Corporation 271,521 Sierra Pacific Resources 311,791 Tenaska Alabama Partners L.P. 176,199 Utilicorp United, Inc. 28,140 ------------ 1,989,714 ------------ WASTE MANAGEMENT / POLLUTION - 1.12% Terra Renewal Services, Inc. 1,451,647 ------------ TOTAL CORPORATE RESTRICTED AND PUBLIC SECURITIES - 98.02% $127,366,196 ============ SEE NOTES TO CONSOLIDATED FINANCIAL STATEMENTS. ---------------------------------------------------------------------------------------------------------------------------------- 30 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (UNAUDITED) 1. HISTORY MassMutual Participation Investors (the "Trust") was organized as a Massachusetts business trust under the laws of the Commonwealth of Massachusetts pursuant to a Declaration of Trust dated April 7, 1988. The Trust is a diversified closed-end management investment company. Babson Capital Management LLC ("Babson Capital"), a wholly-owned indirect subsidiary of Massachusetts Mutual Life Insurance Company ("MassMutual"), acts as its investment adviser. The Trust's investment objective is to maximize total return by providing a high level of current income, the potential for growth of such income, and capital appreciation, by investing primarily in a portfolio of privately placed below investment grade, long-term corporate debt obligations purchased directly from their issuers, at least half of which normally will include equity features. On January 27, 1998, the Board of Trustees authorized the formation of a wholly owned subsidiary of the Trust ("MMPI Subsidiary Trust") for the purpose of holding certain investments. The results of the MMPI Subsidiary Trust are consolidated in the accompanying financial statements. Footnote 2.D below discusses the federal tax consequences of the MMPI Subsidiary Trust. 2. SIGNIFICANT ACCOUNTING POLICIES The following is a summary of significant accounting policies followed consistently by the Trust in the preparation of its consolidated financial statements in conformity with accounting principles generally accepted in the United States of America. A. VALUATION OF INVESTMENTS: Valuation of a security in the Trust's portfolio is made on the basis of market price whenever market quotations are readily available and all securities of the same class held by the Trust can be readily sold in such market. Nearly all securities which are acquired by the Trust directly from the issuers and shares into which such securities may be converted or which may be purchased on the exercise of warrants attached to such securities will be subject to legal or contractual delays in, or restrictions on, resale and will therefore be "restricted securities". Generally speaking, as contrasted with open-market sales of unrestricted securities, which may be effected immediately if the market is adequate, absent an exemption from registration, restricted securities can be sold only in a public offering for which a registration statement is in effect under the Securities Act of 1933, as amended (the "1933 Act"). The value of restricted securities, and of any other assets for which there are no reliable market quotations, is the fair value as determined in good faith by the Trust's Board of Trustees (the "Trustees"). Each restricted security is valued by the Trustees as of the time of its acquisition and at least quarterly thereafter. The Trustees have established guidelines to aid in the valuation of each security. Generally, restricted securities are initially valued at cost or less at the time of acquisition by the Trust. Values greater or less than cost are thereafter used for restricted securities in appropriate circumstances. Among the factors ordinarily considered are the existence of restrictions upon the sale of a security held by the Trust; an estimate of the existence and the extent of a market for the security; the extent of any discount at which the security was acquired; the estimated period of time during which the security will not be freely marketable; the estimated expenses of registering or otherwise qualifying the security for public sale; estimated underwriting commissions if underwriting would be required to effect a sale; in the case of a convertible security, whether or not it would trade on the basis of its stock equivalent; in the case of a debt obligation which would trade independently of any equity equivalent, the current yields on comparable securities; the estimated amount of the floating supply of such securities available for purchase; the proportion of the issue held by the Trust; changes in the financial condition and prospects of the issuer; the existence of merger proposals or tender offers affecting the issuer; and any other factors affecting fair value, all in accordance with the Investment Company Act of 1940, as amended (the"1940 Act"). In making valuations, opinions of counsel may be relied upon as to whether or not securities are restricted securities and as to the legal requirements for public sale. When market quotations are readily available for unrestricted securities of an issuer, restricted securities of the same class are generally valued at a discount from the market price of such unrestricted securities. The Trustees, however, consider all factors in fixing any discount, including the filing of a registration statement for such securities under the 1933 Act and any other developments which are likely to increase the probability that the securities may be publicly sold by the Trust without restriction. The Trustees meet at least once each quarter to value the Trust's portfolio securities as of the close of business on the last business day of the preceding quarter. This valuation requires the approval of a majority of the Trustees of the Trust, including a majority of the Trustees who are not interested persons of the Trust or of Babson Capital, the Trust's investment adviser. In making valuations, the Trustees will consider Babson Capital's reports analyzing each portfolio security in accordance with the relevant factors referred to above. Babson Capital has agreed to provide such reports to the Trust at least quarterly. The consolidated financial statements include private placement restricted securities valued at $91,548,868 (70.46% of net assets) as of June 30, 2006 whose values have been determined by the Trustees in the absence of readily ascertainable -------------------------------------------------------------------------------- 31 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (UNAUDITED) market values. Due to the inherent uncertainty of valuation, those values may differ significantly from the values that would have been used had a ready market for the securities existed, and the differences could be material. The values for corporate public securities are stated at the last reported sales price or at prices based upon quotations obtained from brokers and dealers as of June 30, 2006, subject to discount where appropriate, and are approved by the Trustees. Short-term securities with more than sixty days to maturity are valued at fair value and short-term securities having a maturity of sixty days or less are valued at amortized cost, which approximates market value. B. ACCOUNTING FOR INVESTMENTS: Investment transactions are accounted for on the trade date. Dividend income is recorded on the ex-dividend date. Interest income is recorded on the accrual basis including the amortization of premiums and accretion of discount on bonds held. The Trust does not accrue income when payment is delinquent and when management believes payment is questionable. Realized gains and losses on investment transactions and unrealized appreciation and depreciation of investments are reported for financial statement and federal income tax purposes on the identified cost method. C. USE OF ESTIMATES: The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. D. FEDERAL INCOME TAXES: The Trust has elected to be taxed as a "regulated investment company" under the Internal Revenue Code, and intends to maintain this qualification, and to distribute substantially all of its net taxable income to its shareholders. In any year when net long-term capital gains are realized by the Trust, management, after evaluating the prevailing economic conditions, will recommend that Trustees either designate the net realized longterm gains as undistributed and pay the federal capital gains taxes thereon, or distribute all or a portion of such net gains. The Trust is taxed as a regulated investment company and is therefore limited as to the amount of non-qualified income that it may receive as the result of operating a trade or business, e.g. the Trust's PRO RATA share of income allocable to the Trust by a partnership operating company. The Trust's violation of this limitation could result in the loss of its status as a regulated investment company, thereby subjecting all of its net income and capital gains to corporate taxes prior to distribution to its shareholders. The Trust, from time-to-time, identifies investment opportunities in the securities of entities that could cause such trade or business income to be allocable to the Trust. The MMPI Subsidiary Trust (described in Footnote 1, above) was formed in order to allow investment in such securities without adversely affecting the Trust's status as a regulated investment company. The MMPI Subsidiary Trust is not taxed as a regulated investment company. Accordingly, prior to the Trust's receiving any distributions from the MMPI Subsidiary Trust, all of the MMPI Subsidiary Trust's taxable income and realized gains, including non-qualified income and realized gains, is subject to taxation at prevailing corporate tax rates. For the six months ended June 30, 2006, the MMPI Subsidiary Trust has accrued tax expense on net realized gains of $177,888 and reduced accrued deferred tax expenses on net unrealized gains by $59,081. E. DISTRIBUTIONS TO SHAREHOLDERS: The Trust records distributions to shareholders from net investment income and net realized gains, if any, on the ex-dividend date. The Trust's net investment income dividend is declared four times per year, in April, July, October, and December. The Trust's net realized capital gain distribution, if any, is declared in December. 3. INVESTMENT ADVISORY AND ADMINISTRATIVE SERVICES FEE A. SERVICES: Under an Investment Advisory and Administrative Services Contract (the "Contract") with the Trust, Babson Capital has agreed to use its best efforts to present to the Trust a continuing and suitable investment program consistent with the investment objectives and policies of the Trust. Babson Capital represents the Trust in any negotiations with issuers, investment banking firms, securities brokers or dealers and other institutions or investors relating to the Trust's investments. Under the Contract, Babson Capital provides administration of the day-to-day operations of the Trust and provides the Trust with office space and office equipment, accounting and bookkeeping services, and necessary executive, clerical and secretarial personnel for the performance of the foregoing services. B. FEE: For its services under the Contract, Babson Capital is paid a quarterly Investment Advisory fee equal to .225% of the value of the Trust's net assets as of the last business day of each fiscal quarter, an amount approximately equivalent to .90% on an annual basis. A majority of the Trustees, including a majority of the Trustees who are not interested persons of the Trust or of Babson Capital, approve the valuation of the Trust's net assets as of such day. -------------------------------------------------------------------------------- 32 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (CONTINUED) C. BASIS FOR BOARD RENEWAL OF CONTRACT: At a meeting of the Board of Trustees of the Trust held on April 21, 2006, the Board of Trustees (including a majority of the Trustees who are not "interested persons" of the Trust or Babson Capital) unanimously approved a one year continuance of the Contract, dated October 7, 1988. Prior to the meeting, the Board of Trustees requested and received from Ropes & Gray LLP ("Ropes & Gray"), counsel to the Trust, a memorandum describing the Board of Trustees' legal responsibilities in connection with its review and reapproval of the Contract. The Board of Trustees also requested and received from Babson Capital extensive written and oral information regarding: the principal terms of the Contract; the reasons why Babson Capital was proposing the continuance of the Contract; Babson Capital and its personnel; the Trust's investment performance, including comparative performance information; the nature and quality of the services provided by Babson Capital to the Trust; financial strength of Babson Capital; the fee arrangements; fee and expense information, including comparative fee and expense information; profitability of the advisory arrangement to Babson Capital; and "fallout" benefits to Babson Capital resulting from the Contract as well as certain possible conflicts. Among other things, the Trustees discussed and considered with management i) the aforementioned guidance provided by Ropes & Gray and the information provided by Babson Capital prior to the meeting and (ii) the reasons Babson Capital put forth in support of its recommendation that the Trustees approve the continuance of the Contract. These reasons are summarized below. NATURE, EXTENT AND QUALITY OF SERVICES TO BE PROVIDED BY BABSON CAPITAL In evaluating the scope and quality of the services provided by Babson Capital, the Trustees considered, among other factors: (i) the scope of services required to be provided by Babson Capital under the Contract; (ii) Babson Capital's ability to find and negotiate private placement securities having equity features; (iii) the experience and quality of Babson Capital's staff; (iv) the strength of Babson Capital's financial condition; (v) the nature of the private placement market compared to public markets (including the fact that finding, analyzing, negotiating and servicing private placement securities is more labor-intensive than buying and selling public securities and the administration of private placement securities is more extensive, expensive, and requires greater time and expertise than a portfolio of only public securities); (vi) the Trust's ability to co-invest in negotiated private placements with MassMutual; and (vii) the expansion of the scope of services provided by Babson Capital as a result of recent regulatory and legislative initiatives that have required increased legal, compliance and business attention and diligence. Based on such considerations, the Board of Trustees concluded that, overall, they are satisfied with the nature, extent and quality of services provided, and expected to be provided in the future, under the renewed Contract. INVESTMENT PERFORMANCE The Board also examined the Trust's short-term, intermediate-term, and long-term performance as compared against appropriate benchmark indices presented at the meeting, which showed that the Trust had outperformed such indices for the 1, 3, 5, and 10-year periods. In addition, the Trustees considered comparisons of the Trust's performance with the performance of (i) selected closed-end investment companies and funds that may invest in private placement securities and/or bank loans; (ii) selected business development companies with comparable types of investments; and (iii) investment companies included in the Lipper closed-end bond universe. It was acknowledged that, while such comparisons are helpful in judging performance, they are not directly comparable in terms of types of investments and due to the fact that the business development companies often reported returns based on market value, which is affected by factors other than the performance of the underlying portfolio investments. Based on these considerations and the detailed performance information provided to the Trustees at the regular Board meetings each quarter, the Trustees concluded that the Trust's absolute and relative performance over time have been sufficient to warrant re-approval of the Contract. ADVISORY FEE/COST OF SERVICES PROVIDED AND PROFITABILITY/ MANAGER'S "FALL-OUT" BENEFITS In connection with the Trustees' consideration of the advisory fee paid by the Trust to Babson Capital under the Contract, Babson Capital noted that it was unaware of any closed-end investment companies that are directly comparable to the Trust in terms of the types of investments and percentages invested in private placement securities (which require more extensive advisory and administrative services than a portfolio of publicly traded securities, as previously discussed) other than MassMutual Corporate Investors ("Corporate Investors"), which also is advised by Babson Capital. Under the terms of a new investment services contract, effective October 1, 2005, Corporate Investors is charged a quarterly investment advisory fee of 0.3125% of net asset value as of the end of each quarter, which is approximately equal to 1.25% annually, with no performance adjustment. The new Corporate Investors' contract provides that for its first eighteen months, the investment advisory fee cannot exceed the amount that Corporate Investors would have paid under its prior contract. Under the prior contract Corporate Investors paid Babson Capital a quarterly advisory fee equal to 5/16 of 1% of Corporate Investors' NAV (an amount equivalent to 1.25% on an annual basis) subject to a quarterly performance adjustment of 1/16 of 1% (approximately equal to .25% on an annual basis). In considering the fee rate provided in the Contract, the Trustees noted the Trust's different investment objectives between the Trust and Corporate Investors and the advisory fee charged by Tower Square Capital Partners, L.P and Tower Square Capital Partners II, L.P., both private mez- -------------------------------------------------------------------------------- 33 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (CONTINUED) zanine funds managed by Babson Capital. At the request of the Trustees, Babson Capital also provided information concerning the profitability of Babson Capital's advisory relationship with the Trust. The Board also considered the non-economic benefits Babson Capital and its affiliates derived from its relationship with the Trust, including the reputational benefits derived from having the Trust listed on the New York Stock Exchange, and the de minimis amount of commissions resulting from the Trust's portfolio transactions used by Babson Capital for third-party soft dollar arrangements (less than $1,000). The Trustees recognized that Babson Capital should be entitled to earn a reasonable level of profit for services provided to the Trust and, based on their review, concluded that they were satisfied that Babson Capital's historical level of profitability from its relationship with the Trust was not excessive and that the advisory fee structure under the Contract is reasonable. ECONOMIES OF SCALE The Trustees considered the concept of economies of scale and possible advisory fee reductions if the Trust were to grow in assets. Given that the Trust is not continuously offering shares, such growth comes principally from retained net realized gain on investments and dividend reinvestment. The Trustees also examined the scale down features of selected competitive funds and noted that the minimum starting point for fee reductions in those funds was at least $200 million whereas the Trust's current net assets are near $100 million. The Trustees concluded that the absence of breakpoints in the fee schedule under the Contract was acceptable given the Trust's size and circumstances. 4. SENIOR SECURED INDEBTEDNESS A. NOTE PAYABLE: MassMutual holds the Trust's $12,000,000 Senior Fixed Rate Convertible Note (the "Note") issued by the Trust in 1995. The Note, as amended, is due December 13, 2011 and accrues interest at 5.80% per annum. MassMutual, at its option, can convert the principal amount of the Note into common shares. The dollar amount of principal would be converted into an equivalent dollar amount of common shares based upon the average price of the common shares for ten business days prior to the notice of conversion. For the six months ended June 30, 2006, the Trust incurred total interest expense on the Note of $348,000. The Trust may redeem the Note, in whole or in part, at the principal amount proposed to be redeemed together with the accrued and unpaid interest thereon through the redemption date plus a Make Whole Premium. The Make Whole Premium equals the excess of (i) the present value of the scheduled payments of principal and interest which the Trust would have paid but for the proposed redemption, discounted at the rate of interest of U.S. Treasury obligations whose maturity approximates that of the Note plus 0.50% over (ii) the principal of the Note proposed to be redeemed. B. REVOLVING CREDIT AGREEMENT: The Trust entered into a $15,000,000 Revolving Credit Agreement with Bank of America (formerly Fleet National Bank) (the "Agent Bank") dated May 29, 1997, which had a stated maturity date of May 31, 2004. The maturity date of this loan was extended to May 31, 2007, and its terms amended and restated pursuant to the First Amended and Restated Revolving Credit Agreement (the "Revolver") dated May 27, 2004, between the Trust and the Agent Bank. The Revolver bears interest payable quarterly in arrears at a per annum rate that varies depending upon whether the Trust requests a Base Rate Loan or LIBOR Rate Loan. Interest on Base Rate loans equals the higher of: (i) the annual "Base Rate" as set periodically by the Agent Bank and (ii) the most recent Federal Funds Effective Rate plus .50% per annum. Per annum interest on LIBOR Rate Loans equals .60% plus the London Inter Bank Offered Rate ("LIBOR") rate, divided by 1 minus LIBOR Reserve Rate. The Trust also incurs expense on the undrawn portion of the total Revolver at a rate of .25% per annum. As of June 30, 2006, there were no outstanding loans against the Revolver. For the six months ended June 30, 2006, the Trust incurred expense on the Revolver of $18,596 related to the undrawn portion. 5. PURCHASES AND SALES OF INVESTMENTS FOR THE SIX MONTHS ENDED 6/30/2006 COST OF PROCEEDS FROM INVESTMENTS SALES OR ACQUIRED MATURITIES ------------ ------------ Corporate restricted securities $ 20,860,404 $ 12,085,858 Corporate public securities 1,991,276 9,298,255 The aggregate cost of investments is substantially the same for financial reporting and federal income tax purposes as of June 30, 2006. The net unrealized appreciation of investments for financial reporting and federal tax purposes as of June 30, 2006 is $753,647 and consists of $12,313,037 appreciation and $11,559,390 depreciation. Net unrealized appreciation of investments on the Statement of Assets and Liabilities reflects the balance net of a deferred tax accrual of $116,333 on net unrealized gains in the MMPI Subsidiary Trust. -------------------------------------------------------------------------------- 34 NOTES TO CONSOLIDATED FINANCIAL STATEMENTS MASSMUTUAL PARTICIPATION INVESTORS (CONTINUED) 6. QUARTERLY RESULTS OF INVESTMENT OPERATIONS MARCH 31, 2006 AMOUNT PER SHARE ----------- ----------- Investment income $ 3,229,245 Net investment income $ 2,668,897 $ 0.27 Net realized and unrealized gain $ 3,988,640 $ 0.41 on investments (net of taxes) JUNE 30, 2006 AMOUNT PER SHARE ----------- ----------- Investment income $ 3,094,537 Net investment income $ 2,530,332 $ 0.26 Net realized and unrealized gain $ 3,610,163 $ 0.37 on investments (net of taxes) 7. AGGREGATE REMUNERATION PAID TO OFFICERS, TRUSTEES AND THEIR AFFILIATED PERSONS For the six months ended June 30, 2006, the Trust paid its Trustees aggregate remuneration of $57,375. During the period the Trust did not pay any compensation to any of its Trustees who are "interested persons" (as defined by the 1940 Act) of the Trust. The Trust currently classifies Messrs. Crandall and Joyal as "interested persons" of the Trust. All of the Trust's officers are employees of Babson Capital or MassMutual. Pursuant to the Investment Advisory and Administrative Services Contract, the Trust does not compensate its officers who are employees of Babson Capital or MassMutual. Mr. Crandall, one of the Trust's Trustees was an "affiliated person" (as defined by the 1940 Act) of MassMutual and Babson Capital. The Trust did not make any payments to Babson Capital for the six months ended June 30, 2006, other than amounts payable to Babson Capital pursuant to the Contract. For the six months ended June 30, 2006, the Trust paid the following amounts to MassMutual, exclusive of interest expense on the Note explained in Footnote 4.A: Preparation of the Trust's Quarterly and Annual Reports to Shareholders $ 7,078 Preparation of Certain of the Trust's Shareholder Communications 208 Preparation of the Trust's Annual Proxy Statements 241 ------- $ 7,527 ======= 8. RESULTS OF SHAREHOLDER MEETING The Annual Meeting of Shareholders was held on Friday, April 21, 2006. The Shareholders voted to elect Roger W. Crandall and Martin T. Hart as trustees, each for a three-year term. The Trust's other trustees (Donald E. Benson, Michael H. Brown, Donald Glickman, Robert E. Joyal, Jack A. Laughery and Corine T. Norgaard) continued to serve their respective terms following the April 21, 2006 Annual Shareholders Meeting. The results of the Shareholders' votes are set forth below. TRUSTEE ROGER W. MARTIN T. CRANDALL HART --------- --------- Shares for 8,497,142 8,507,659 Withheld 163,267 152,750 Total 8,660,409 8,660,409 % of Shares Voted for 98.11% 98.24% 9. SUBSEQUENT EVENT At the Board of Trustees' July 18, 2006 quarterly meeting, the Board voted to expand the Board from eight to nine Trustees and appointed William J. Barrett as a Trustee for a three-year term of office. -------------------------------------------------------------------------------- 35 THIS PAGE INTENTIONALLY LEFT BLANK. TRUSTEES OFFICERS William J. Barrett Roger W. Crandall Chairman Donald E. Benson* Clifford M. Noreen President Michael H. Brown James M. Roy Vice President & Chief Financial Officer Roger W. Crandall Rodney J. Dillman Vice President & Donald Glickman Secretary Martin T. Hart* Jill A. Fricchione Vice President Robert E. Joyal Michael P. Hermsen Vice President Jack A. Laughery Mary Wilson Kibbe Vice President Corine T. Norgaard* Michael L. Klofas Vice President Richard E. Spencer, II Vice President Ronald S. Talaia Treasurer John T. Davitt, Jr. Comptroller Melissa M. LaGrant Chief Compliance Officer *MEMBER OF THE AUDIT COMMITTEE -------------------------------------------------------------------------------- DIVIDEND REINVESTMENT AND SHARE PURCHASE PLAN MassMutual Participation Investors offers a Dividend Reinvestment and Cash Purchase Plan. The Plan provides a simple and automatic way for shareholders to add to their holdings in the Trust through the receipt of dividend shares issued by the Trust or through the reinvestment of cash dividends in Trust shares purchased in the open market. The dividends of each shareholder will be automatically reinvested in the Trust by Shareholder Financial Services Inc., the Transfer Agent, in accordance with the Plan, unless such shareholder elects not to participate by providing written notice to the Transfer Agent. A shareholder may terminate his or her participation by notifying the Transfer Agent in writing. Participating shareholders may also make additional contributions to the Plan from their own funds. Such contributions may be made by personal check or other means in an amount not less than $100 nor more than $5,000 per quarter. Whenever the Trust declares a dividend payable in cash or shares, the Transfer Agent, acting on behalf of each participating shareholder, will take the dividend in shares only if the net asset value is lower than the market price plus an estimated brokerage commission as of the close of business on the valuation day. The valuation day is the last day preceding the day of dividend payment. When the dividend is to be taken in shares, the number of shares to be received is determined by dividing the cash dividend by the net asset value as of the close of business on the valuation date or, if greater than net asset value, 95% of the closing share price. If the net asset value of the shares is higher than the market value plus an estimated commission, the Transfer Agent, consistent with obtaining the best price and execution, will buy shares on the open market at current prices promptly after the dividend payment date. The reinvestment of dividends does not, in any way, relieve participating shareholders of any federal, state or local tax. For federal income tax purposes, the amount reportable in respect of a dividend received in newlyissued shares of the Trust will be the fair market value of the shares received, which will be reportable as ordinary income and/or capital gains. As compensation for its services, the Transfer Agent receives a fee of 5% of any dividend and cash contribution (in no event in excess of $2.50 per distribution per shareholder.) Any questions regarding the Plan should be addressed to Shareholder Financial Services, Inc., Agent for MassMutual Participation Investors' Dividend Reinvestment and Cash Purchase Plan, P.O. Box 173673, Denver CO 80217-3673. [LOGO] MASSMUTUAL PARTICIPATION INVESTORS DB1040 806 ITEM 2. CODE OF ETHICS. Not applicable for this filing. ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. Not applicable for this filing. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. Not applicable for this filing. ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS. Not applicable for this filing. ITEM 6. SCHEDULE OF INVESTMENTS Not applicable for this filing. ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED END MANAGEMENT INVESTMENT COMPANIES. Not applicable for this filing. ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable for this filing. There have been no changes in any of the Portfolio Managers identified in the Registrant's most recent annual report on Form N-CSR. ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS. Not Applicable for this filing. ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS. Not Applicable for this filing. ITEM 11. CONTROLS AND PROCEDURES. (a) The principal executive officer and principal financial officer of the Registrant evaluated the effectiveness of the Registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940 (the "Act")) as of a date within 90 days of the filing date of this report and based on that evaluation have concluded that such disclosure controls and procedures are effective to provide reasonable assurance that material information required to be disclosed by the Registrant on Form N-CSR is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms. (b) There were no changes in the Registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Act) during the Registrant's second fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Registrant's internal control over financial reporting. ITEM 12. EXHIBITS. (a)(1) ANY CODE OF ETHICS, OR AMENDMENTS THERETO, THAT IS THE SUBJECT OF DISCLOSURE REQUIRED BY ITEM 2, TO THE EXTENT THAT THE REGISTRANT INTENDS TO SATISFY THE ITEM 2 REQUIREMENTS THROUGH THE FILING OF AN EXHIBIT. None. (a)(2) A SEPARATE CERTIFICATION FOR EACH PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER OF THE REGISTRANT AS REQUIRED BY RULE 30a-2 UNDER THE ACT. Attached hereto as EX-99.31.1 Attached hereto as EX-99.31.2 (a)(3) ANY WRITTEN SOLICITATION TO PURCHASE SECURITIES UNDER RULE 23c-1 UNDER THE ACT (17 CFR 270.23c-1) SENT OR GIVEN DURING THE PERIOD COVERED BY THE REPORT BY OR ON BEHALF OF THE REGISTRANT TO 10 OR MORE PERSONS. Not Applicable for this filing. (b) CERTIFICATIONS PURSUANT TO RULE 30a-2(b) UNDER THE ACT. Attached hereto as EX-99.32 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant): MassMutual Participation Investors ---------------------------------- By: /s/ Clifford M Noreen ---------------------------------- Clifford M Noreen, President ---------------------------------- Date: September 5, 2006 ---------------------------------- Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated. By: /s/ Clifford M Noreen ---------------------------------- Clifford M Noreen, President ---------------------------------- Date: September 5, 2006 ---------------------------------- By: /s/ James M. Roy ---------------------------------- James M. Roy, Vice President, and Chief Financial Officer ---------------------------------- Date: September 5, 2006 ----------------------------------